Red brass and Tombac

Red brass noun - Brass with enough copper to give it a reddish tint; used for plumbing pipe and other brass hardware and in cheap jewelry.

Tombac and red brass are semantically related. In some cases you can use "Tombac" instead a noun phrase "Red brass".

Tombac noun - An alloy of copper and zinc (and sometimes arsenic) used to imitate gold in cheap jewelry and for gilding.

Red brass and tombac are semantically related. You can use "Red brass" instead a noun "Tombac".