transeunt vs transient

transeunt is not a noun while transient is a noun.

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

As adjectives, transeunt and transient are synonyms defined as:

transeunt and transient: of a mental act; causing effects outside the mind

transeunt (noun)	transient (noun)
	(physics) a short-lived oscillation in a system caused by a sudden change of voltage or current or load
	one who stays for only a short time

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