dark red vs claret

dark red and claret both are nouns.

Word	Noun	Adjective	Verb	Adverb
dark red	Yes	No	No	No
claret	Yes	No	Yes	No

As nouns, claret is a hyponym of dark red; that is, claret is a word with a more specific, narrower meaning than dark red:

Other hyponyms of dark red include burgundy, oxblood red, wine-colored, wine-coloured, wine.

dark red (noun)	claret (noun)
a red color that reflects little light	a dark purplish-red color
	dry red Bordeaux or Bordeaux-like wine

dark red (verb)	claret (verb)
	drink claret