back matter vs supplement

back matter and supplement both are nouns.

Word	Noun	Adjective	Verb	Adverb
back matter	Yes	No	No	No
supplement	Yes	No	Yes	No

back matter (noun)	supplement (noun)
written matter following the main text of a book	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

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