qualifier vs contestant

qualifier and contestant both are nouns.

Word	Noun	Adjective	Verb	Adverb
qualifier	Yes	No	No	No
contestant	Yes	No	No	No

As nouns, contestant is a hypernym of qualifier; that is, contestant is a word with a broader meaning than qualifier:

qualifier: a contestant who meets certain requirements and so qualifies to take part in the next stage of competition
contestant: a person who participates in competitions

qualifier (noun)	contestant (noun)
a content word that qualifies the meaning of a noun or verb	a person who participates in competitions
a contestant who meets certain requirements and so qualifies to take part in the next stage of competition	a person who dissents from some established policy