anion vs superoxide

anion and superoxide both are nouns.

Word	Noun	Adjective	Verb	Adverb
anion	Yes	No	No	No
superoxide	Yes	No	No	No

As nouns, superoxide is a hyponym of anion; that is, superoxide is a word with a more specific, narrower meaning than anion:

Other hyponyms of anion include hydroxide ion, hydroxyl ion, superoxide anion.

anion (noun)	superoxide (noun)
a negatively charged ion	the univalent anion O2-
	a metallic oxide containing the univalent anion O2-