Ar vs argonon

Ar and argonon both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ar	Yes	No	No	No
argonon	Yes	No	No	No

As nouns, argonon is a hypernym of Ar; that is, argonon is a word with a broader meaning than Ar:

Ar: a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
argonon: any of the chemically inert gaseous elements of the helium group in the periodic table

Other hypernyms of Ar include inert gas, noble gas.

Ar (noun)	argonon (noun)
a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere	any of the chemically inert gaseous elements of the helium group in the periodic table