cylinder block vs casting

cylinder block and casting both are nouns.

Word	Noun	Adjective	Verb	Adverb
cylinder block	Yes	No	No	No
casting	Yes	No	No	No

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

cylinder block: a metal casting containing the cylinders and cooling ducts of an engine
casting: object formed by a mold

Other hypernyms of cylinder block include cast.

cylinder block (noun)	casting (noun)
a metal casting containing the cylinders and cooling ducts of an engine	the act of creating something by casting it in a mold
	the act of throwing a fishing line out over the water by means of a rod and reel
	the choice of actors to play particular roles in a play or movie
	object formed by a mold