Main Difference
The main difference between Agonist and Antagonist is that the Agonist is a chemical substance which, upon binding to a receptor, leads to its activation and Antagonist is a character of a work actively opposing the protagonist
Agonist
An agonist is a chemical that binds to a receptor and activates the receptor to produce a biological response. Whereas an agonist causes an action, an antagonist blocks the action of the agonist, and an inverse agonist causes an action opposite to that of the agonist.
Antagonist
An antagonist is the character in a story who is against the protagonist.
Agonist (noun)
Someone involved in a contest or battle (as in an agon), protagonist.
Agonist (noun)
The muscle that contracts while the other relaxes.
“When bending the elbow, the biceps is the agonist.”
Agonist (noun)
A molecule that can combine with a receptor on a cell to produce a physiological reaction.
“Acetylcholine is an agonist at the cholinergic receptor.”
Antagonist (noun)
An opponent or enemy.
Antagonist (noun)
One who antagonizes or stirs.
Antagonist (noun)
A chemical that binds to a receptor but does not produce a physiological response, blocking the action of agonist chemicals.
Antagonist (noun)
The main character or force opposing the protagonist in a literary work or drama.
Antagonist (noun)
A muscle that acts in opposition to another.
“A flexor, which bends a part, is the antagonist of an extensor, which extends it.”
Antagonist (noun)
a person who actively opposes or is hostile to someone or something; an adversary
“he turned to confront his antagonist”
Antagonist (noun)
a substance which interferes with or inhibits the physiological action of another
“LSD is a serotonin antagonist”
Antagonist (noun)
a muscle whose action counteracts that of another specified muscle.