bullock block vs pulley-block

bullock block and pulley-block both are nouns.

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

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

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

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

bullock block (noun)	pulley-block (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