phenomenal
Primper.
pepperoni
plaza
The longest word starting with a "P" is pneumonoultramicroscopicsilicovolcanoconiosis, which has 45 letters and is in the Guinness Book of Records. It was, however, coined for the specific purpose of becoming the longest word, and is not a specifically recognized form of silicosis.
pollen
Pregnant :P
what word starting with s is a synonym for technology? playful
"Panic" is a word starting with P that can mean stress.
One is the word "peculiar."
Peculiar
preposterous
Pertickuless
planet Pluto
procrastinate
pi
Pail.