athenaeum vs atheneum

athenaeum and atheneum both are nouns.

Word	Noun	Adjective	Verb	Adverb
athenaeum	Yes	No	No	No
atheneum	Yes	No	No	No

As nouns, athenaeum and atheneum are synonyms defined as:

As nouns, athenaeum and atheneum are synonyms defined as:

athenaeum and atheneum: a literary or scientific association for the promotion of learning

athenaeum (noun)	atheneum (noun)
a place where reading materials are available	a place where reading materials are available
a literary or scientific association for the promotion of learning	a literary or scientific association for the promotion of learning