Biscuit and Olive brown

Biscuit noun - Small round bread leavened with baking-powder or soda.

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

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

Biscuit and olive brown are semantically related in light brown topic. You can use "Biscuit" instead a noun phrase "Olive brown".