matter vs res judicata

matter and res judicata both are nouns.

Word	Noun	Adjective	Verb	Adverb
matter	Yes	No	Yes	No
res judicata	Yes	No	No	No

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

Other hyponyms of matter include area, blind spot, remit, res adjudicata.

matter (noun)	res judicata (noun)
that which has mass and occupies space	a matter already settled in court; cannot be raised again
(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)	res judicata (verb)
have weight; have import, carry weight