argon vs noble gas

argon and noble gas both are nouns.

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

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

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

Other hypernyms of argon include argonon, inert gas.

argon (noun)	noble gas (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