osmium vs Os

osmium and Os both are nouns.

Word	Noun	Adjective	Verb	Adverb
osmium	Yes	No	No	No
Os	Yes	No	No	No

As nouns, osmium and Os are synonyms defined as:

osmium and Os: a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known

Other synonyms of osmium include atomic number 76.

osmium (noun)	Os (noun)
a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known	a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known