The difference between Jack and Knave
When used as nouns, jack means a mechanical device used to raise and (temporarily) support a heavy object, e.g. screw jack, scissor jack, hydraulic jack, ratchet jack, scaffold jack, whereas knave means a boy.
Jack is also verb with the meaning: to use a jack.
check bellow for the other definitions of Jack and Knave
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Jack as a noun:
A mechanical device used to raise and (temporarily) support a heavy object, e.g. screw jack, scissor jack, hydraulic jack, ratchet jack, scaffold jack.
Examples:
"She used a jack to lift her car and changed the tire."
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Jack as a noun:
A man or men in general.
Examples:
"Every man jack''."
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Jack as a noun:
A male animal.
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Jack as a noun:
A male ass.
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Jack as a noun (card games):
A playing card with the letter "J" and the image of a knave or prince on it, the eleventh card in a given suit. Also called a .
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Jack as a noun (cricket, by extension):
The eleventh batsman to come to the crease in an innings.
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Jack as a noun (archaic):
A knave (a servant or later, a deceitful man).
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Jack as a noun (sports):
A target ball in bowls, etc; a jack-ball.
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Jack as a noun (games):
A small, six-pointed playing piece used in the game of jacks.
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Jack as a noun (colloquial, euphemistic):
Nothing, jack shit.
Examples:
"You haven't done jack. Get up and get this room cleaned up right now!"
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Jack as a noun (nautical):
A small flag at the bow of a ship.
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Jack as a noun (nautical):
A naval ensign flag flown from the main mast, mizzen mast, or the aft-most major mast of (especially) British sailing warships; Union Jack.
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Jack as a noun (military):
A coarse and cheap medieval coat of defense, especially one made of leather.
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Jack as a noun:
A penny with a head on both sides, used for cheating.
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Jack as a noun (slang):
Money.
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Jack as a noun (slang, Appalachians):
A smooth often ovoid large gravel or small cobble in a natural water course.
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Jack as a noun:
, related to the mango tree.
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Jack as a noun:
The freshwater pike, or pickerel.
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Jack as a noun:
A large California rockfish, the bocaccio, .
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Jack as a noun:
Any of the marine fish in the family Carangidae.
Examples:
"synonyms: jack mackerel"
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Jack as a noun (obsolete, nautical):
A sailor, a jacktar.
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Jack as a noun (obsolete):
A pitcher or can of waxed leather, supposed to resemble a jackboot; a black-jack.
Examples:
"rfquotek John Dryden"
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Jack as a noun (UK, dialect, obsolete):
A drinking measure holding half a pint or, sometimes, a quarter of a pint.
Examples:
"rfquotek Halliwell"
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Jack as a noun (mining):
A mechanical contrivance, an auxiliary machine, or a subordinate part of a machine. A device to pull off boots. A sawhorse or sawbuck. A machine for turning a spit; a smokejack. A wooden wedge for separating rocks rent by blasting. A lever for depressing the sinkers which push the loops down on the needles in a knitting machine. A grating to separate and guide the threads in a warping machine; a heck box. A machine for twisting the sliver as it leaves the carding machine. A compact, portable machine for planing metal. A machine for slicking or pebbling leather. A system of gearing driven by a horse power, for multiplying speed. A hood or other device placed over a chimney or vent pipe, to prevent a back draught. In the harpsichord, an intermediate piece communicating the action of the key to the quill; also called hopper. In hunting, the pan or frame holding the fuel of the torch used to attract game at night; also, the light itself. A bar of iron athwart ships at a topgallant masthead, to support a royal mast, and give spread to the royal shrouds; also called jack crosstree.
Examples:
"rfquotek C. Hallock"
"rfquotek R. H. Dana, Jr"
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Jack as a noun:
A surface-mounted connector for electrical, especially telecommunications, equipment.
Examples:
"telephone jack"
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Jack as a noun:
Female ended electrical connector (see Electrical connector)
Examples:
"synonyms: socket"
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Jack as a noun:
Electrical connector in a fixed position (see Gender of connectors and fasteners)
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Jack as a verb (transitive):
To use a jack.
Examples:
"He jacked the car up so that he could replace the brake pads."
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Jack as a verb (transitive):
To raise or increase.
Examples:
"If you want to jack your stats you just write off failures as invalid results."
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Jack as a verb:
To produce by freeze distillation; to distil (an alcoholic beverage) by freezing it and removing the ice (which is water), leaving the alcohol (which remains liquid).
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Jack as a verb (transitive, colloquial):
To steal something, typically an automobile. Shortened form of carjacking.
Examples:
"Someone jacked my car last night!"
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Jack as a verb (intransitive):
To dance by moving the torso forward and backward in a rippling motion.
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Jack as a noun (slang, baseball):
A home run.
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Jack as a verb (transitive, slang, baseball):
To hit (the ball) hard; especially, to hit (the ball) out of the field, producing a home run.
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Jack as a noun:
A coarse mediaeval coat of defence, especially one made of leather.
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Jack as a noun:
A jackfruit tree.
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Knave as a noun (archaic):
A boy; especially, a boy servant.
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Knave as a noun (archaic):
Any male servant; a menial.
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Knave as a noun:
A tricky, deceitful fellow; a dishonest person.
Examples:
"synonyms: rogue villain"
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Knave as a noun (cards):
A playing card marked with the figure of a servant or soldier; a jack.