orthopteran vs orthopterous insect

orthopteran and orthopterous insect both are nouns.

Word	Noun	Adjective	Verb	Adverb
orthopteran	Yes	No	No	No
orthopterous insect	Yes	No	No	No

As nouns, orthopteran and orthopterous insect are synonyms defined as:

orthopteran and orthopterous insect: any of various insects having leathery forewings and membranous hind wings and chewing mouthparts

Other synonyms of orthopteran include orthopteron.

orthopteran (noun)	orthopterous insect (noun)
any of various insects having leathery forewings and membranous hind wings and chewing mouthparts	any of various insects having leathery forewings and membranous hind wings and chewing mouthparts