cobalt vs atomic number 27

cobalt and atomic number 27 both are nouns.

Word	Noun	Adjective	Verb	Adverb
cobalt	Yes	No	No	No
atomic number 27	Yes	No	No	No

As nouns, cobalt and atomic number 27 are synonyms defined as:

cobalt and atomic number 27: a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition

Other synonyms of cobalt include Co.

cobalt (noun)	atomic number 27 (noun)
a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition	a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition