atomic number 77 vs Ir

atomic number 77 and Ir both are nouns.

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

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

atomic number 77 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 atomic number 77 include iridium.

atomic number 77 (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