remnant vs remain

remnant is a noun but remain is not a noun.

Word	Noun	Adjective	Verb	Adverb
remnant	Yes	No	No	No
remain	No	No	Yes	No

remnant (noun)	remain (noun)
a piece of cloth that is left over after the rest has been used or sold
a small part or portion that remains after the main part no longer exists

remnant (verb)	remain (verb)
	stay the same; remain in a certain state
	be in a certain place and not leave
	continue in a place, position, or situation
	be left; of persons, questions, problems, results, evidence, etc.