Auburn and Red-brown

Auburn adjective - (of hair) colored a moderate reddish-brown.

Red-brown and auburn are semantically related. in reddish-brown topic. In some cases you can use "Red-brown" instead an adjective "Auburn".

Red-brown adjective - Of brown tinged with red.

Auburn and red-brown are semantically related. Sometimes you can replace term "Auburn" with "Red-brown", this terms are similar.