vermilion vs cinnabar

vermilion and cinnabar both are nouns.

Word	Noun	Adjective	Verb	Adverb
vermilion	Yes	Yes	Yes	No
cinnabar	Yes	Yes	No	No

As adjectives, vermilion and cinnabar are synonyms defined as:

Other synonyms of vermilion include Chinese-red, vermillion.

vermilion (noun)	cinnabar (noun)
a variable color that is vivid red but sometimes with an orange tinge	large red-and-black European moth; larvae feed on leaves of ragwort; introduced into United States to control ragwort
	a heavy reddish mineral consisting of mercuric sulfide; the chief source of mercury

vermilion (adjective)	cinnabar (adjective)
of a vivid red to reddish-orange color	of a vivid red to reddish-orange color

vermilion (verb)	cinnabar (verb)
color vermilion