gayness vs homosexualism

gayness and homosexualism both are nouns.

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

As nouns, gayness and homosexualism are synonyms defined as:

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

Other synonyms of gayness include homoeroticism, homosexuality, queerness.

gayness (noun)	homosexualism (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