queer vs homosexual

queer and homosexual both are nouns.

Word	Noun	Adjective	Verb	Adverb
queer	Yes	Yes	Yes	No
homosexual	Yes	Yes	No	No

As nouns, homosexual is a hypernym of queer; that is, homosexual is a word with a broader meaning than queer:

Other hypernyms of queer include gay, homo, homophile.

queer (noun)	homosexual (noun)
offensive term for a homosexual man	someone who is sexually attracted to persons of the same sex

queer (adjective)	homosexual (adjective)
homosexual or arousing homosexual desires	sexually attracted to members of your own sex
beyond or deviating from the usual or expected

queer (verb)	homosexual (verb)
put in a dangerous, disadvantageous, or difficult position
hinder or prevent (the efforts, plans, or desires) of