neon vs noble gas

neon and noble gas both are nouns.

Word	Noun	Adjective	Verb	Adverb
neon	Yes	No	No	No
noble gas	Yes	No	No	No

As nouns, noble gas is a hypernym of neon; that is, noble gas is a word with a broader meaning than neon:

neon: 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
noble gas: any of the chemically inert gaseous elements of the helium group in the periodic table

Other hypernyms of neon include argonon, inert gas.

neon (noun)	noble 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