atomic number 51 vs antimony

atomic number 51 and antimony both are nouns.

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

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

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

Other synonyms of atomic number 51 include Sb.

atomic number 51 (noun)	antimony (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