Umber and Yellow-brown

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

Yellow-brown and umber are semantically related. In some cases you can use "Yellow-brown" instead an adjective "Umber".

Yellow-brown adjective - Of a medium to dark brownish yellow color.

Umber and yellow-brown are semantically related. Sometimes you can use "Umber" instead an adjective phrase "Yellow-brown".