two-winged insects vs order Diptera

two-winged insects and order Diptera both are nouns.

Word	Noun	Adjective	Verb	Adverb
two-winged insects	Yes	No	No	No
order Diptera	Yes	No	No	No

two-winged insects (noun)	order Diptera (noun)
insects having usually a single pair of functional wings (anterior pair) with the posterior pair reduced to small knobbed structures and mouth parts adapted for sucking or lapping or piercing	a large order of insects having a single pair of wings and sucking or piercing mouths; includes true flies and mosquitoes and gnats and crane flies