scarlet vs red

scarlet and red both are nouns.

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

As adjectives, scarlet and red are synonyms defined as:

scarlet and red: 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 scarlet include blood-red, carmine, cerise, cherry-red, cherry, crimson, reddish, ruby-red, ruby, ruddy.

As nouns, red is a hypernym of scarlet; that is, red is a word with a broader meaning than scarlet:

scarlet: a variable color that is vivid red but sometimes with an orange tinge
red: red color or pigment; the chromatic color resembling the hue of blood

Other hypernyms of scarlet include redness.

scarlet (noun)	red (noun)
a variable color that is vivid red but sometimes with an orange tinge	red color or pigment; the chromatic color resembling the hue of blood
	emotionally charged terms used to refer to extreme radicals or revolutionaries
	the amount by which the cost of a business exceeds its revenue

scarlet (adjective)	red (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	(especially of the face) reddened or suffused with or as if with blood from emotion or exertion
	of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies
	characterized by violence or bloodshed