transience vs impermanence

transience and impermanence both are nouns.

Word	Noun	Adjective	Verb	Adverb
transience	Yes	No	No	No
impermanence	Yes	No	No	No

As nouns, impermanence is a hypernym of transience; that is, impermanence is a word with a broader meaning than transience:

transience: an impermanence that suggests the inevitability of ending or dying
impermanence: the property of not existing for indefinitely long durations

Other hypernyms of transience include impermanency.

transience (noun)	impermanence (noun)
an impermanence that suggests the inevitability of ending or dying	the property of not existing for indefinitely long durations
the attribute of being brief or fleeting