homosexual vs queer

homosexual and queer both are nouns.

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

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

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

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

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