complementary vs antonymous

complementary is a noun but antonymous is not a noun.

Word	Noun	Adjective	Verb	Adverb
complementary	Yes	Yes	No	No
antonymous	No	Yes	No	No

complementary (noun)	antonymous (noun)
either one of two chromatic colors that when mixed together give white (in the case of lights) or grey (in the case of pigments)

complementary (adjective)	antonymous (adjective)
acting as or providing a complement (something that completes the whole)	of words: having opposite meanings
of words or propositions so related that each is the negation of the other