gayness vs sapphism

gayness and sapphism both are nouns.

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

As nouns, sapphism is a hyponym of gayness; that is, sapphism is a word with a more specific, narrower meaning than gayness:

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

Other hyponyms of gayness include inversion, sexual inversion, lesbianism, paederasty, pederasty.

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