Furcula and Os

Furcula noun - A forked bone formed by the fusion of the clavicles of most birds.

Os and furcula are semantically related. In some cases you can use "Os" instead a noun "Furcula".

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

Furcula and os are semantically related. Sometimes you can replace term "Furcula" with "Os", this nouns are similar.