Reddish-brown and Reddish brown

Reddish-brown adjective - Of brown tinged with red.

Reddish brown and reddish-brown are semantically related In some cases you can replace phrase "Reddish brown" with "Reddish-brown", this phrases are similar.

Reddish brown noun - A shade of brown with a tinge of red.

Reddish-brown and reddish brown are semantically related in coppery-brown color topic. You can use "Reddish-brown" instead an adjective phrase "Reddish brown".