lepidopteran vs lepidopteron

lepidopteran and lepidopteron both are nouns.

Word	Noun	Adjective	Verb	Adverb
lepidopteran	Yes	No	No	No
lepidopteron	Yes	No	No	No

As nouns, lepidopteran and lepidopteron are synonyms defined as:

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

Other synonyms of lepidopteran include lepidopterous insect.

lepidopteran (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