General:
* Parable: A story that illustrates a moral or religious lesson.
* Parade: A public procession, usually with music and colorful displays.
* Paradise: A place of perfect happiness and beauty.
* Paradox: A statement that seems contradictory but may be true.
* Parallel: Running or lying side by side and having the same distance between each point.
* Parameter: A numerical or other measurable factor that defines a system or sets the conditions of its operation.
* Paraphrase: To express the meaning of something in different words.
* Parasite: An organism that lives in or on another organism and benefits by deriving nutrients at the other's expense.
* Paralyze: To make unable to move or act.
* Paranormal: Relating to phenomena such as telepathy or clairvoyance that are beyond the scope of normal scientific understanding.
* Paranoia: A mental condition characterized by delusions of persecution, grandeur, or jealousy.
* Parenthesis: A word, phrase, or sentence inserted into a passage to explain or qualify something.
Medical/Scientific:
* Paralysis: Loss of movement or feeling in part or all of the body.
* Parathyroid: A small gland in the neck that regulates calcium levels in the blood.
* Paramedic: A person trained to provide emergency medical care.
* Parasitology: The branch of biology that studies parasites.
* Parasympathetic: Part of the autonomic nervous system that regulates the body's resting functions.
* Paraffin: A waxy substance derived from petroleum, used in candles, cosmetics, and other products.
* Paradigm: A typical example or pattern of something.
* Paragon: A person or thing regarded as a perfect example of a particular quality.
* Paralytic: A person who is paralyzed.
* Paralyzing: Causing paralysis.
Other:
* Paragraph: A distinct section of a piece of writing, usually indicated by a new line and indentation.
* Parakeet: A small, brightly colored parrot.
* Paralytic: A person who is paralyzed.
* Paralysis: Loss of movement or feeling in part or all of the body.
* Paralyzing: Causing paralysis.
This is not an exhaustive list, but it gives you a good starting point.