lepidopteron vs lepidopterous insect

lepidopteron and lepidopterous insect both are nouns.

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

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

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

Other synonyms of lepidopteron include lepidopteran.

lepidopteron (noun)	lepidopterous insect (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