Os and Talus

Os noun - A hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known.

Talus and os are semantically related. In some cases you can replace term "Talus" with "Os", this nouns are similar.

Talus noun - The bone in the ankle that articulates with the leg bones to form the ankle joint.

Os and talus are semantically related. Sometimes you can use "Os" instead a noun "Talus".