sapphism vs homosexuality

sapphism and homosexuality both are nouns.

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

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

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

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

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