ephemerality vs transiency

ephemerality and transiency both are nouns.

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

As nouns, transiency is a hypernym of ephemerality; that is, transiency is a word with a broader meaning than ephemerality:

ephemerality: the property of lasting for a very short time
transiency: an impermanence that suggests the inevitability of ending or dying

Other hypernyms of ephemerality include transience, transitoriness.

ephemerality (noun)	transiency (noun)
the property of lasting for a very short time	an impermanence that suggests the inevitability of ending or dying