reddish vs scarlet

reddish is not a noun while scarlet is a noun.

Word	Noun	Adjective	Verb	Adverb
reddish	No	Yes	No	No
scarlet	Yes	Yes	No	No

As adjectives, reddish and scarlet are synonyms defined as:

reddish and scarlet: of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies

Other synonyms of reddish include blood-red, carmine, cerise, cherry-red, cherry, crimson, red, ruby-red, ruby, ruddy.

reddish (noun)	scarlet (noun)
	a variable color that is vivid red but sometimes with an orange tinge

reddish (adjective)	scarlet (adjective)
of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies	of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies