Disk operating system and Os

Disk operating system noun - An operating system that is on a disk.

Os and disk operating system are semantically related. In some cases you can use "Os" instead a noun phrase "Disk operating system".

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

Disk operating system and os are semantically related. Sometimes you can replace phrase "Disk operating system" with "Os", this terms are similar.