cinnabar vs vermilion

cinnabar and vermilion both are nouns.

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

As adjectives, cinnabar and vermilion are synonyms defined as:

Other synonyms of cinnabar include Chinese-red, vermillion.

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

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

cinnabar (verb)	vermilion (verb)
	color vermilion