atomic number 10 vs inert gas

atomic number 10 and inert gas both are nouns.

Word	Noun	Adjective	Verb	Adverb
atomic number 10	Yes	No	No	No
inert gas	Yes	No	No	No

As nouns, inert gas is a hypernym of atomic number 10; that is, inert gas is a word with a broader meaning than atomic number 10:

atomic number 10: a colorless odorless gaseous element that gives a red glow in a vacuum tube; one of the six inert gasses; occurs in the air in small amounts
inert gas: any of the chemically inert gaseous elements of the helium group in the periodic table

Other hypernyms of atomic number 10 include argonon, noble gas.

atomic number 10 (noun)	inert gas (noun)
a colorless odorless gaseous element that gives a red glow in a vacuum tube; one of the six inert gasses; occurs in the air in small amounts	any of the chemically inert gaseous elements of the helium group in the periodic table