matter vs end matter

matter and end matter both are nouns.

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

As nouns, end matter is a hyponym of matter; that is, end matter is a word with a more specific, narrower meaning than matter:

matter (noun)	end matter (noun)
that which has mass and occupies space	written matter following the main text of a book
(used with negation) having consequence
some situation or event that is thought about
a vaguely specified concern
a problem
written works (especially in books or magazines)

matter (verb)	end matter (verb)
have weight; have import, carry weight