atomic number 51 vs Sb

atomic number 51 and Sb both are nouns.

Word	Noun	Adjective	Verb	Adverb
atomic number 51	Yes	No	No	No
Sb	Yes	No	No	No

As nouns, atomic number 51 and Sb are synonyms defined as:

atomic number 51 and Sb: a metallic element having four allotropic forms; used in a wide variety of alloys; found in stibnite

Other synonyms of atomic number 51 include antimony.

atomic number 51 (noun)	Sb (noun)
a metallic element having four allotropic forms; used in a wide variety of alloys; found in stibnite	a metallic element having four allotropic forms; used in a wide variety of alloys; found in stibnite