block has 43 distinct synonyms spread across 18 of its 28 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is unblock.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
interrupt the normal function of by means of anesthesia
“block a nerve”
stamp or emboss a title or design on a book with a block
“block the book cover”
support, secure, or raise with a block
“block a plate for printing”
shape into a block or blocks
“block the graphs so one can see the results clearly”
prohibit the conversion or use of (assets)
“Blocked funds”
Synonyms, antonyms and the broader and narrower relations for block come from Princeton University’s WordNet. Full sources and licences.
a rectangular area in a city surrounded by streets and usually containing several buildings
“he lives in the next block”
a number or quantity of related things dealt with as a unit
“he reserved a large block of seats”
(computer science) a sector or group of sectors that function as the smallest data unit permitted
“since blocks are often defined as a single sector, the terms `block' and `sector' are sometimes used interchangeably”
an inability to remember or think of something you normally can do; often caused by emotional tension
“I knew his name perfectly well but I had a temporary block”
a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope
a metal casting containing the cylinders and cooling ducts of an engine
“the engine had to be replaced because the block was cracked”
an obstruction in a pipe or tube
“we had to call a plumber to clear out the blockage in the drainpipe”
a platform from which an auctioneer sells
“they put their paintings on the block”
the act of obstructing or deflecting someone's movements