atheneum vs athenaeum

atheneum and athenaeum both are nouns.

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

As nouns, atheneum and athenaeum are synonyms defined as:

As nouns, atheneum and athenaeum are synonyms defined as:

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

atheneum (noun)	athenaeum (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