cylinder block vs engine block

cylinder block and engine block both are nouns.

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

As nouns, cylinder block and engine block are synonyms defined as:

cylinder block and engine block: a metal casting containing the cylinders and cooling ducts of an engine

Other synonyms of cylinder block include block.

cylinder block (noun)	engine block (noun)
a metal casting containing the cylinders and cooling ducts of an engine	a metal casting containing the cylinders and cooling ducts of an engine