Ethmoid and Os

Ethmoid noun - One of the eight bones of the cranium; a small bone filled with air spaces that forms part of the eye sockets and the nasal cavity.

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

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

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