Common Words:
* Appear: To become visible, to come into view.
* Appetite: A desire or craving for food.
* Apple: A sweet, edible fruit.
* April: The fourth month of the year.
* Appointment: A meeting or engagement.
* Approve: To give permission or agree to something.
* Approach: To move closer to something or someone.
* Appropriate: Suitable or fitting for a particular purpose.
Less Common Words:
* Apathy: Lack of interest, enthusiasm, or concern.
* Apex: The highest point or top.
* Apocalypse: A complete and final devastation.
* Aphorism: A concise and pointed statement of a general truth.
* Apolitical: Not interested in or concerned with politics.
* Apparent: Clearly visible or understood.
* Apparition: A ghost or phantom.
* Applaud: To express approval or admiration, usually by clapping.
* Apply: To put into practice or use.
* Aptitude: A natural ability or talent.
* Aqua: Relating to or consisting of water.
* Arable: Suitable for growing crops.
Scientific/Technical Words:
* Aperture: An opening, especially one that lets in light.
* Aphelion: The point in a planet's orbit that is farthest from the sun.
* Apiculture: The practice of raising bees.
* Apogee: The point in an orbit farthest from the Earth.
* Appendage: A part that is attached to something else.
* Appendix: An additional section at the end of a book or document.
* Apparent magnitude: The brightness of a celestial object as seen from Earth.
* Apoptosis: The process of programmed cell death.
* Aquatic: Living in or relating to water.
* Aqueous: Composed of or containing water.
This is not an exhaustive list, but it gives you a good starting point. The prefix "ap-" can be used in a variety of words with different meanings.