Reddish-brown and Umber

Reddish-brown adjective - Of brown tinged with red.

Umber and reddish-brown are semantically related. In some cases you can use "Umber" instead an adjective phrase "Reddish-brown".

Umber adjective - Of the color of any of various natural brown earth pigments.

Reddish-brown and umber are semantically related. Sometimes you can use "Reddish-brown" instead an adjective "Umber".