atomic number 111 vs element 111

atomic number 111 and element 111 both are nouns.

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

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

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

Other synonyms of atomic number 111 include Rg, roentgenium.

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