neptunium vs atomic number 93

neptunium and atomic number 93 both are nouns.

Word	Noun	Adjective	Verb	Adverb
neptunium	Yes	No	No	No
atomic number 93	Yes	No	No	No

As nouns, neptunium and atomic number 93 are synonyms defined as:

neptunium and atomic number 93: a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium

Other synonyms of neptunium include Np.

neptunium (noun)	atomic number 93 (noun)
a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium	a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium