lesbianism vs queerness

lesbianism and queerness both are nouns.

Word	Noun	Adjective	Verb	Adverb
lesbianism	Yes	No	No	No
queerness	Yes	No	No	No

As nouns, queerness is a hypernym of lesbianism; that is, queerness is a word with a broader meaning than lesbianism:

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

Other hypernyms of lesbianism include gayness, homoeroticism, homosexualism, homosexuality.

lesbianism (noun)	queerness (noun)
female homosexuality	a sexual attraction to (or sexual relations with) persons of the same sex
	a strange attitude or habit