atomic reactor vs atomic pile

atomic reactor and atomic pile both are nouns.

Word	Noun	Adjective	Verb	Adverb
atomic reactor	Yes	No	No	No
atomic pile	Yes	No	No	No

As nouns, atomic reactor and atomic pile are synonyms defined as:

atomic reactor and atomic pile: a nuclear reactor that uses controlled nuclear fission to generate energy

Other synonyms of atomic reactor include chain reactor, pile.

atomic reactor (noun)	atomic pile (noun)
a nuclear reactor that uses controlled nuclear fission to generate energy	a nuclear reactor that uses controlled nuclear fission to generate energy