matter vs topic

matter and topic both are nouns.

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

As nouns, matter and topic are synonyms defined as:

Other synonyms of matter include issue, subject.

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

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