Basic Forms:
* Act: To perform an action, to behave in a certain way.
* Action: The process of doing something, an act or deed.
* Activity: State of being active, engagement in work or action.
* Actor: One who performs in a play, movie, or other performance.
* Actress: A female actor.
Derived Words:
* Interact: To act on or influence each other.
* React: To respond to an action or stimulus.
* Enact: To make into law, to put into effect.
* Transact: To carry out a business deal or transaction.
* Exact: To demand or require something, to be precise.
* Active: Engaged in action or work, lively, energetic.
* Inactive: Not active, not working or functioning.
* Actual: Real, existing in fact, not imagined.
* Practice: To do something repeatedly in order to improve.
* Practical: Concerned with actual use or application, useful.
* Activist: A person who campaigns for political or social change.
* Reactionary: Opposing change, conservative.
* Reaction: A response to something, often an involuntary one.
* Reactivate: To make active again.
Compound Words:
* Actuary: A person who calculates insurance risks and premiums.
* Reactionary: Opposing change, conservative.
* Interactivity: The ability of a system or product to respond to user actions.
* Reactivation: The process of making something active again.
This is just a small sample of the many words derived from the Latin root "act." By understanding this root, you can better understand the meaning of many English words.