sepia vs Indian red

sepia and Indian red both are nouns.

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

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

sepia: a shade of brown with a tinge of red
Indian red: a reddish-brown color resembling the red soil used as body paint by American Indians

Other hyponyms of sepia include brick red, copper, copper color.

sepia (noun)	Indian red (noun)
a shade of brown with a tinge of red	a reddish-brown color resembling the red soil used as body paint by American Indians
rich brown pigment prepared from the ink of cuttlefishes	a red soil containing ferric oxide; often used as a pigment
	a red pigment composed in part from ferric oxide which is often used in paints and cosmetics