bullock block vs pulley

bullock block and pulley both are nouns.

Word	Noun	Adjective	Verb	Adverb
bullock block	Yes	No	No	No
pulley	Yes	No	No	No

As nouns, pulley is a hypernym of bullock block; that is, pulley is a word with a broader meaning than bullock block:

bullock block: a pulley-block at the head of a topmast
pulley: 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

Other hypernyms of bullock block include block, pulley-block, pulley block.

bullock block (noun)	pulley (noun)
a pulley-block at the head of a topmast	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