end matter vs postscript

end matter and postscript both are nouns.

Word	Noun	Adjective	Verb	Adverb
end matter	Yes	No	No	No
postscript	Yes	No	No	No

end matter (noun)	postscript (noun)
written matter following the main text of a book	a note appended to a letter after the signature
	textual matter that is added onto a publication; usually at the end