ephemeral vs insect

ephemeral and insect both are nouns.

Word	Noun	Adjective	Verb	Adverb
ephemeral	Yes	Yes	No	No
insect	Yes	No	No	No

As nouns, insect is a hypernym of ephemeral; that is, insect is a word with a broader meaning than ephemeral:

ephemeral: anything short-lived, as an insect that lives only for a day in its winged form
insect: small air-breathing arthropod

ephemeral (noun)	insect (noun)
anything short-lived, as an insect that lives only for a day in its winged form	small air-breathing arthropod
	a person who has a nasty or unethical character undeserving of respect

ephemeral (adjective)	insect (adjective)
lasting a very short time