- protagonist, agonist - the principal character in a work of fiction
--1 is a kind of fictional character, fictitious character, character
--1 has particulars: antihero - agonist - someone involved in a contest or battle (as in an agon)
--2 is a kind of contestant
Antonyms: adversary, antagonist, opponent, opposer, resister
- agonist - a muscle that contracts while another relaxes; "when bending the elbow the biceps are the agonist"
--3 is a kind of antagonistic muscle
- agonist - (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction
--4 is a kind of drug
- agonist - (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction