orthopteron vs orthopteran

orthopteron and orthopteran both are nouns.

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

As nouns, orthopteron and orthopteran are synonyms defined as:

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

Other synonyms of orthopteron include orthopterous insect.

orthopteron (noun)	orthopteran (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