fugacious vs ephemeral

fugacious is not a noun while ephemeral is a noun.

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

As adjectives, fugacious and ephemeral are synonyms defined as:

Other synonyms of fugacious include passing, short-lived, transient, transitory.

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

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