Brownness and Olive brown

Brownness noun - An orange of low brightness and saturation.

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

Olive brown noun - A shade of brown tinged with green.

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