Beige and Olive brown

Beige noun - A very light brown.

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

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

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