atomic number 77 vs iridium

atomic number 77 and iridium both are nouns.

Word	Noun	Adjective	Verb	Adverb
atomic number 77	Yes	No	No	No
iridium	Yes	No	No	No

As nouns, atomic number 77 and iridium are synonyms defined as:

atomic number 77 and iridium: a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium

Other synonyms of atomic number 77 include Ir.

atomic number 77 (noun)	iridium (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