Ne vs inert gas

Ne and inert gas both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ne	Yes	No	No	No
inert gas	Yes	No	No	No

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

Ne: 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 Ne include argonon, noble gas.

Ne (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