Brownness and Reddish brown

Brownness noun - An orange of low brightness and saturation.

Reddish brown and brownness are semantically related. In some cases you can replace phrase "Reddish brown" with "Brownness", this terms are similar.

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

Brownness and reddish brown are semantically related. Sometimes you can use "Brownness" instead a noun phrase "Reddish brown".