krypton vs inert gas

krypton and inert gas both are nouns.

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

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

krypton: a colorless element that is one of the six inert gasses; occurs in trace amounts in air
inert gas: any of the chemically inert gaseous elements of the helium group in the periodic table

Other hypernyms of krypton include argonon, noble gas.

krypton (noun)	inert gas (noun)
a colorless element that is one of the six inert gasses; occurs in trace amounts in air	any of the chemically inert gaseous elements of the helium group in the periodic table