ephemeron vs ephemeral

ephemeron and ephemeral both are nouns.

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

As nouns, ephemeron and ephemeral are synonyms defined as:

ephemeron and ephemeral: anything short-lived, as an insect that lives only for a day in its winged form

ephemeron (noun)	ephemeral (noun)
anything short-lived, as an insect that lives only for a day in its winged form	anything short-lived, as an insect that lives only for a day in its winged form

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