supplemental vs supplement

supplemental is not a noun while supplement is a noun.

Word	Noun	Adjective	Verb	Adverb
supplemental	No	Yes	No	No
supplement	Yes	No	Yes	No

supplemental (noun)	supplement (noun)
	a supplementary component that improves capability
	a quantity added (e.g. to make up for a deficiency)
	textual matter that is added onto a publication; usually at the end

supplemental (adjective)	supplement (adjective)
added to complete or make up a deficiency
functioning in a supporting capacity

supplemental (verb)	supplement (verb)
	add to the very end
	add as a supplement to what seems insufficient
	serve as a supplement to