orthopterous insect vs orthopteron

orthopterous insect and orthopteron both are nouns.

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

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

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

Other synonyms of orthopterous insect include orthopteran.

orthopterous insect (noun)	orthopteron (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