antonymous vs complementary

antonymous is not a noun while complementary is a noun.

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

antonymous (noun)	complementary (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)

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