rubicund vs sanguine

rubicund is not a noun while sanguine is a noun.

Word	Noun	Adjective	Verb	Adverb
rubicund	No	Yes	No	No
sanguine	Yes	Yes	No	No

As adjectives, rubicund and sanguine are synonyms defined as:

rubicund and sanguine: inclined to a healthy reddish color often associated with outdoor life

Other synonyms of rubicund include florid, ruddy.

rubicund (noun)	sanguine (noun)
	chalk of a reddish-brown colour that resembles dried blood
	a blood-red color

rubicund (adjective)	sanguine (adjective)
inclined to a healthy reddish color often associated with outdoor life	inclined to a healthy reddish color often associated with outdoor life
	confidently optimistic and cheerful