Prefixes:
* pre-: This is the most common form, meaning "before" or "prior to".
* preamble: An introduction to a speech or document.
* precede: To come before something else in time or order.
* preconception: A preconceived idea or opinion.
* prediction: A statement about what might happen in the future.
* prefix: A word or part of a word that is added to the beginning of another word to change its meaning.
Other words:
* prey: An animal hunted and killed by another for food.
* preen: To tidy and smooth one's feathers or fur.
* press: A machine used for printing, or the act of printing.
* presently: Soon; at this time.
* prevent: To stop something from happening.
* previous: Coming before something else in time or order.
* primate: A mammal that belongs to the group that includes humans, apes, and monkeys.
* prime: First in importance or rank.
* prince: A male ruler of a country.
* princess: A female ruler of a country, or the daughter of a king or queen.
This is not an exhaustive list, but it provides a good starting point for exploring words with "pre".