Rg vs element 111

Rg and element 111 both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rg	Yes	No	No	No
element 111	Yes	No	No	No

As nouns, Rg and element 111 are synonyms defined as:

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

Other synonyms of Rg include atomic number 111, roentgenium.

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