homosexualism vs homosexuality

homosexualism and homosexuality both are nouns.

Word	Noun	Adjective	Verb	Adverb
homosexualism	Yes	No	No	No
homosexuality	Yes	No	No	No

As nouns, homosexualism and homosexuality are synonyms defined as:

homosexualism and homosexuality: a sexual attraction to (or sexual relations with) persons of the same sex

Other synonyms of homosexualism include gayness, homoeroticism, queerness.

homosexualism (noun)	homosexuality (noun)
a sexual attraction to (or sexual relations with) persons of the same sex	a sexual attraction to (or sexual relations with) persons of the same sex