Common words:
* Cap: A covering for the head.
* Capital: A city that is the seat of government.
* Caption: A brief description accompanying an image.
* Captain: A leader of a team or group.
* Capacity: The maximum amount that something can hold or contain.
* Captivate: To attract and hold the attention of someone.
* Capsule: A small container, often for medicine.
* Capricorn: A zodiac sign.
Less common words:
* Capricious: Impulsive and unpredictable.
* Capsize: To overturn, especially a boat.
* Captivating: Charming and fascinating.
* Cappuccino: A coffee drink with frothed milk.
* Capriole: A leaping movement in which a horse kicks up its hind legs.
* Capstan: A vertical drum used for hauling ropes.
* Capuchin: A type of monkey.
* Captivate: To attract and hold someone's attention.
Words with a prefix "cap-":
* Cap-a-pie: From head to foot.
* Cap-and-trade: A system for reducing pollution.
This is just a small selection of words that start with "cap." Let me know if you're interested in a specific category of words or need more examples!