Rg vs atomic number 111

Rg and atomic number 111 both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rg	Yes	No	No	No
atomic number 111	Yes	No	No	No

As nouns, Rg and atomic number 111 are synonyms defined as:

Rg and atomic number 111: a radioactive transuranic element, with atomic number 111

Other synonyms of Rg include element 111, roentgenium.

Rg (noun)	atomic number 111 (noun)
a radioactive transuranic element, with atomic number 111	a radioactive transuranic element, with atomic number 111