Os and Palatine bone

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

Palatine bone and os are semantically related. In some cases you can replace phrase "Palatine bone" with "Os", this terms are similar.

Palatine bone noun - Either of two irregularly shaped bones that form the back of the hard palate and helps to form the nasal cavity and the floor of the orbits.

Os and palatine bone are semantically related. You can use "Os" instead a noun phrase "Palatine bone".