engine block vs cylinder block

engine block and cylinder block both are nouns.

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

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

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

Other synonyms of engine block include block.

engine block (noun)	cylinder 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