The difference between Cast and Form
When used as nouns, cast means an act of throwing, whereas form means the shape or visible structure of a thing or person.
When used as verbs, cast means to throw, whereas form means to assume (a certain shape or visible structure).
check bellow for the other definitions of Cast and Form
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Cast as a verb (physical):
To throw. To throw forward (a fishing line, net etc.) into the sea. Specifically, to throw down or aside. To throw off (the skin) as a process of growth; to shed the hair or fur of the coat. To cause (a horse or other large animal) to lie down with its legs underneath it. To remove, take off (clothes). To heave the lead and line in order to ascertain the depth of water. To vomit. To throw up, as a mound, or rampart. To throw out or emit; to exhale.
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Cast as a verb:
To direct (one's eyes, gaze etc.).
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Cast as a verb (dated):
To add up (a column of figures, accounts etc.); cross-cast refers to adding up a row of figures.
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Cast as a verb (social):
To calculate the astrological value of (a horoscope, birth etc.). To plan, intend. To assign (a role in a play or performance). To assign a role in a play or performance to (an actor). To consider; to turn or revolve in the mind; to plan. To impose; to bestow; to rest. To defeat in a lawsuit; to decide against; to convict. To turn (the balance or scale); to overbalance; hence, to make preponderate; to decide.
Examples:
"The director cast the part carefully."
"The director cast John Smith as King Lear."
"to cast about for reasons"
"to be cast in damages"
"a casting voice"
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Cast as a verb:
To perform, bring forth (a magical spell or enchantment).
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Cast as a verb:
To throw (light etc.) on or upon something, or in a given direction.
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Cast as a verb (archaic):
To give birth to (a child) prematurely; to miscarry.
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Cast as a verb (printing, dated):
To shape (molten metal etc.) by pouring into a mould; to make (an object) in such a way. To stereotype or electrotype.
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Cast as a verb:
To twist or warp (of fabric, timber etc.).
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Cast as a verb (nautical):
To bring the bows of a sailing ship on to the required tack just as the anchor is weighed by use of the headsail; to bring (a ship) round.
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Cast as a verb:
To deposit (a ballot or voting paper); to formally register (one's vote).
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Cast as a verb (computing):
To change a variable type from, for example, integer to real, or integer to text.
Examples:
"'Casting is generally an indication of bad design."
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Cast as a verb (hunting):
Of dogs, hunters: to spread out and search for a scent.
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Cast as a verb (medicine):
To set (a bone etc.) in a cast.
Examples:
"rfex some are still missing examples"
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Cast as a verb (Wicca):
To open a circle in order to begin a spell or meeting of witches.
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Cast as a noun:
An act of throwing.
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Cast as a noun:
Something which has been thrown, dispersed etc.
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Cast as a noun:
A small mass of earth "thrown off" or excreted by a worm.
Examples:
"The area near the stream was covered with little bubbly worm casts."
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Cast as a noun:
The collective group of actors performing a play or production together. Contrasted with crew.
Examples:
"He’s in the cast of Oliver."
"The cast was praised for a fine performance."
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Cast as a noun:
The casting procedure.
Examples:
"The men got into position for the cast, two at the ladle, two with long rods, all with heavy clothing."
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Cast as a noun:
An object made in a mould.
Examples:
"The cast would need a great deal of machining to become a recognizable finished part."
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Cast as a noun:
A supportive and immobilising device used to help mend broken bones.
Examples:
"The doctor put a cast on the boy’s broken arm."
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Cast as a noun:
The mould used to make cast objects.
Examples:
"A plaster cast was made from his face''."
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Cast as a noun (hawking):
The number of hawks (or occasionally other birds) cast off at one time; a pair.
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Cast as a noun:
A squint.
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Cast as a noun:
Visual appearance.
Examples:
"Her features had a delicate cast to them."
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Cast as a noun:
The form of one's thoughts, mind etc.
Examples:
"a cast of mind, a mental tendency."
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Cast as a noun:
An animal, especially a horse, that is unable to rise without assistance.
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Cast as a noun:
Animal and insect remains which have been regurgitated by a bird.
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Cast as a noun:
A group of crabs.
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Form as a noun (physical):
To do with shape. The shape or visible structure of a thing or person. A thing that gives shape to other things as in a mold. Characteristics not involving atomic components. A long bench with no back. The boundary line of a material object. In painting, more generally, the human body. The combination of planes included under a general crystallographic symbol. It is not necessarily a closed solid.
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Form as a noun (social):
To do with structure or procedure. An order of doing things, as in religious ritual. Established method of expression or practice; fixed way of proceeding; conventional or stated scheme; formula. Constitution; mode of construction, organization, etc.; system. Show without substance; empty, outside appearance; vain, trivial, or conventional ceremony; conventionality; formality. A class or rank in society. A criminal record; loosely, past history (in a given area). A class or year of school pupils (often preceded by an ordinal number to specify the year, as in ).
Examples:
"a republican form of government"
"a matter of mere form'"
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Form as a noun:
A blank document or template to be filled in by the user.
Examples:
"To apply for the position, complete the application form."
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Form as a noun:
Level of performance.
Examples:
"The team's form has been poor this year."
"The orchestra was on top form this evening."
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Form as a noun (grammar):
A grouping of words which maintain grammatical context in different usages; the particular shape or structure of a word or part of speech.
Examples:
"participial forms;  verb forms'"
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Form as a noun:
The den or home of a hare.
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Form as a noun (computing, programming):
A window or dialogue box.
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Form as a noun (taxonomy):
An infraspecific rank.
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Form as a noun (printing, dated):
The type or other matter from which an impression is to be taken, arranged and secured in a chase.
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Form as a noun (geometry):
A quantic.
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Form as a noun (sports, fitness):
A specific way of performing a movement.
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Form as a verb (transitive):
To assume (a certain shape or visible structure).
Examples:
"When you kids form a straight line I'll hand out the lollies."
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Form as a verb (transitive):
To give (a shape or visible structure) to a thing or person.
Examples:
"Roll out the dough to form a thin sheet."
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Form as a verb (intransitive):
To take shape.
Examples:
"When icicles start to form on the eaves you know the roads will be icy."
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Form as a verb:
To put together or bring into being; assemble.
Examples:
"The socialists did not have enough MPs to form a government."
"Paul McCartney and John Lennon formed The Beatles in Liverpool in 1960."
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Form as a verb (transitive, linguistics):
To create (a word) by inflection or derivation.
Examples:
"By adding "-ness", you can form a noun from an adjective."
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Form as a verb (transitive):
To constitute, to compose, to make up.
Examples:
"Teenagers form the bulk of extreme traffic offenders."
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Form as a verb:
To mould or model by instruction or discipline.
Examples:
"Singing in a choir helps to form a child's sociality."
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Form as a verb:
To provide (a hare) with a form.
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Form as a verb (electrical, historical, transitive):
To treat (plates) to prepare them for introduction into a storage battery, causing one plate to be composed more or less of spongy lead, and the other of lead peroxide. This was formerly done by repeated slow alternations of the charging current, but later the plates or grids were coated or filled, one with a paste of red lead and the other with litharge, introduced into the cell, and formed by a direct charging current.