leftover vs remnant

leftover and remnant both are nouns.

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

As nouns, leftover and remnant are synonyms defined as:

leftover and remnant: a small part or portion that remains after the main part no longer exists

leftover (noun)	remnant (noun)
a small part or portion that remains after the main part no longer exists	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

leftover (adjective)	remnant (adjective)
not used up