Synonyms of OS

What is another word for OS
1.

Synonyms of OS

noun - a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals

ATOMIC NUMBER    

noun - (computer science) software that controls the execution of computer programs and may provide various services

noun - the left eye

noun - rigid connective tissue that makes up the skeleton of vertebrates

2.

Synonyms of OS