The difference between Block and Roof
When used as nouns, block means a substantial, often approximately cuboid, piece of any substance, whereas roof means the external covering at the top of a building.
When used as verbs, block means to fill (something) so that it is not possible to pass, whereas roof means to cover or furnish with a roof.
check bellow for the other definitions of Block and Roof
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Block as a noun:
A substantial, often approximately cuboid, piece of any substance.
Examples:
"a block of ice"
"a block of stone"
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Block as a noun:
A chopping block; cuboid base for cutting or beheading.
Examples:
"Anne Boleyn placed her head on the block and awaited her execution."
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Block as a noun:
A group of urban lots of property, several acres in extent, not crossed by public streets.
Examples:
"I'm going for a walk around the block."
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Block as a noun:
A residential building consisting of flats.
Examples:
"a block of flats"
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Block as a noun:
The distance from one street to another in a city that is built (approximately) to a grid pattern.
Examples:
"The place you are looking for is two long blocks east and one short block north."
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Block as a noun:
Interference or obstruction of cognitive processes.
Examples:
"a [[mental]] block"
"[[writer's block]]"
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Block as a noun (slang):
The human head.
Examples:
"I'll knock your block off!"
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Block as a noun:
A wig block: a simplified head model upon which wigs are worn.
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Block as a noun:
A mould on which hats, bonnets, etc., are shaped.
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Block as a noun:
A set of sheets (of paper) joined together at one end.
Examples:
"a block of 100 tickets"
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Block as a noun (computing):
A logical data storage unit containing one or more physical sectors (see cluster).
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Block as a noun (programming):
A region of code in a program that acts as a single unit, such as a function or loop.
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Block as a noun (cryptography):
A fixed-length group of bits making up part of a message.
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Block as a noun (rigging):
A case with one or more sheaves/pulleys, used with ropes to increase or redirect force, for example, as part of the rigging of a sailing ship.
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Block as a noun (chemistry):
A portion of a macromolecule, comprising many units, that has at least one feature not present in adjacent portions.
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Block as a noun:
Something that prevents something from passing.
Examples:
"synonyms barrier blockage obstruction"
"There's a block in the pipe that means the water can't get through."
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Block as a noun (sports):
An action to interfere with the movement of an opposing player or of the object of play (ball, puck).
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Block as a noun (cricket):
A shot played by holding the bat vertically in the path of the ball, so that it loses momentum and drops to the ground.
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Block as a noun (volleyball):
A defensive play by one or more players meant to deflect a spiked ball back to the hitter's court.
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Block as a noun (philately):
A joined group of four (or in some cases nine) postage stamps, forming a roughly square shape.
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Block as a noun:
A section of split logs used as fuel.
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Block as a noun (UK):
Solitary confinement.
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Block as a noun:
A cellblock.
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Block as a noun (falconry):
The perch on which a bird of prey is kept.
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Block as a noun (printing, dated):
A piece of hard wood on which a stereotype or electrotype plate is mounted.
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Block as a noun (obsolete):
A blockhead; a stupid fellow; a dolt.
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Block as a noun (rail):
A section of a railroad where the block system is used.
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Block as a noun (cricket):
The position of a player or bat when guarding the wicket.
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Block as a noun (cricket):
A blockhole.
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Block as a noun (cricket):
The popping crease.
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Block as a verb (transitive):
To fill (something) so that it is not possible to pass.
Examples:
"The pipe is blocked."
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Block as a verb (transitive):
To prevent (something or someone) from passing.
Examples:
"You're blocking the road – I can't get through."
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Block as a verb (transitive):
To prevent (something from happening or someone from doing something).
Examples:
"His plan to take over the business was blocked by the boss."
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Block as a verb (transitive, sports):
To impede an opponent.
Examples:
"He blocked the basketball player's shot."
"The offensive linemen tried to block the blitz."
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Block as a verb (transitive, theater):
To specify the positions and movements of the actors.
Examples:
"It was very difficult to block this scene convincingly."
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Block as a verb (transitive, cricket):
To hit with a block.
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Block as a verb (intransitive, cricket):
To play a block shot.
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Block as a verb (transitive):
To disable communication via telephone, instant messaging, etc., with an undesirable someone.
Examples:
"I tried to send you a message, but you've blocked me!"
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Block as a verb (computing, intransitive):
To wait.
Examples:
"When the condition expression is false, the thread blocks on the condition variable."
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Block as a verb (transitive):
To stretch or mould (a knitted item, a hat, etc.) into the desired shape.
Examples:
"I blocked the mittens by wetting them and pinning them to a shaped piece of cardboard."
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Block as a verb (transitive):
To shape or sketch out roughly.
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Block as a noun:
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Roof as a noun:
The external covering at the top of a building
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Roof as a noun:
The upper part of a cavity.
Examples:
"The palate is the roof of the mouth."
"Archaeologists discovered that the cave's roof was decked with paintings."
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Roof as a noun (mining):
The surface or bed of rock immediately overlying a bed of coal or a flat vein.
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Roof as a verb:
To cover or furnish with a roof.
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Roof as a verb:
To traverse buildings by walking or climbing across their roofs.
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Roof as a verb (slang):
To put into prison for not a short time.