Common Words:
* Agony: Extreme physical or mental suffering.
* Antagonist: A person who actively opposes or is hostile to someone else.
* Protagonist: The main character in a story.
Less Common Words:
* Agonize: To suffer or worry greatly over something.
* Agonal: Relating to the struggle before death.
* Agonistic: Relating to or characterized by competition.
* Agonist: A substance that binds to a receptor and triggers a response.
Words with "agon" as a combining form:
* Diagnosis: The identification of the nature of an illness or other problem.
* Prognosis: A forecast of the likely course of a disease or ailment.
* Cognition: The mental process of knowing, including awareness, perception, reasoning, and judgment.
These are just a few examples. There are many other words that contain the root "agon" in various forms.