fleetingness vs ephemerality

fleetingness and ephemerality both are nouns.

Word	Noun	Adjective	Verb	Adverb
fleetingness	Yes	No	No	No
ephemerality	Yes	No	No	No

As nouns, fleetingness and ephemerality are synonyms defined as:

fleetingness and ephemerality: the property of lasting for a very short time

Other synonyms of fleetingness include ephemeralness.

fleetingness (noun)	ephemerality (noun)
the property of lasting for a very short time	the property of lasting for a very short time