sapphism vs gayness

sapphism and gayness both are nouns.

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

As nouns, gayness is a hypernym of sapphism; that is, gayness is a word with a broader meaning than sapphism:

sapphism: female homosexuality
gayness: a sexual attraction to (or sexual relations with) persons of the same sex

Other hypernyms of sapphism include homoeroticism, homosexualism, homosexuality, queerness.

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