inert gas vs argonon

inert gas and argonon both are nouns.

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

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

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

Other synonyms of inert gas include noble gas.

inert gas (noun)	argonon (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