iridium vs Ir

iridium and Ir both are nouns.

Word	Noun	Adjective	Verb	Adverb
iridium	Yes	No	No	No
Ir	Yes	No	No	No

As nouns, iridium and Ir are synonyms defined as:

iridium and Ir: a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium

Other synonyms of iridium include atomic number 77.

iridium (noun)	Ir (noun)
a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium	a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium