inert gas vs noble gas

inert gas and noble gas both are nouns.

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

As nouns, inert gas and noble gas are synonyms defined as:

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

Other synonyms of inert gas include argonon.

inert gas (noun)	noble gas (noun)
any of the chemically inert gaseous elements of the helium group in the periodic table	any of the chemically inert gaseous elements of the helium group in the periodic table