atomic number 25 vs manganese

atomic number 25 and manganese both are nouns.

Word	Noun	Adjective	Verb	Adverb
atomic number 25	Yes	No	No	No
manganese	Yes	No	No	No

As nouns, atomic number 25 and manganese are synonyms defined as:

atomic number 25 and manganese: a hard brittle grey polyvalent metallic element that resembles iron but is not magnetic; used in making steel; occurs in many minerals

Other synonyms of atomic number 25 include Mn.

atomic number 25 (noun)	manganese (noun)
a hard brittle grey polyvalent metallic element that resembles iron but is not magnetic; used in making steel; occurs in many minerals	a hard brittle grey polyvalent metallic element that resembles iron but is not magnetic; used in making steel; occurs in many minerals