noble gas vs argonon

noble gas and argonon both are nouns.

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

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

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

Other synonyms of noble gas include inert gas.

noble 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