Ecru and Olive brown

Ecru noun - A very light brown.

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

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

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