ephemerality vs fleetingness

ephemerality and fleetingness both are nouns.

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

As nouns, ephemerality and fleetingness are synonyms defined as:

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

Other synonyms of ephemerality include ephemeralness.

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