lepidopterous insect vs lepidopteron

lepidopterous insect and lepidopteron both are nouns.

Word	Noun	Adjective	Verb	Adverb
lepidopterous insect	Yes	No	No	No
lepidopteron	Yes	No	No	No

As nouns, lepidopterous insect and lepidopteron are synonyms defined as:

lepidopterous insect and lepidopteron: insect that in the adult state has four wings more or less covered with tiny scales

Other synonyms of lepidopterous insect include lepidopteran.

lepidopterous insect (noun)	lepidopteron (noun)
insect that in the adult state has four wings more or less covered with tiny scales	insect that in the adult state has four wings more or less covered with tiny scales