agonist vs contestant

agonist and contestant both are nouns.

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

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

agonist (noun)	contestant (noun)
(biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction	a person who participates in competitions
a muscle that contracts while another relaxes	a person who dissents from some established policy
someone involved in a contest or battle (as in an agon)
the principal character in a work of fiction