transience vs transient

transience and transient both are nouns.

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

transience (noun)	transient (noun)
an impermanence that suggests the inevitability of ending or dying	(physics) a short-lived oscillation in a system caused by a sudden change of voltage or current or load
the attribute of being brief or fleeting	one who stays for only a short time

transience (adjective)	transient (adjective)
	of a mental act; causing effects outside the mind
	lasting a very short time