brick red vs sepia

brick red and sepia both are nouns.

Word	Noun	Adjective	Verb	Adverb
brick red	Yes	No	No	No
sepia	Yes	No	No	No

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

Other hypernyms of brick red include burnt sienna, mahogany, reddish brown, Venetian red.

brick red (noun)	sepia (noun)
a bright reddish-brown color	a shade of brown with a tinge of red
	rich brown pigment prepared from the ink of cuttlefishes