orthopteran vs orthopteron

orthopteran and orthopteron both are nouns.

Word	Noun	Adjective	Verb	Adverb
orthopteran	Yes	No	No	No
orthopteron	Yes	No	No	No

As nouns, orthopteran and orthopteron are synonyms defined as:

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

Other synonyms of orthopteran include orthopterous insect.

orthopteran (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