The longest word starting with the letter P is Pneumonoultramicroscopicsilicovolcanoconiosis. It is also the longest word in the English language published in a dictionary. It refers to a lung disease.
Pace, pack, package, pad, padlock, page, pageant, pager, pail, pain, paint, palace, pallet, palm, pamphlet, pan, pancake, panda, panel, pansies, panther, papaya, paper, parable, parachute, paragraph, parakeet, parcel, parent, pathetic, pea, peace, peach, peacock, peak, peanut, pear, pearl, pebble, pecan, peck, peculiarity, peddler, pedestal, pedestrian, pedometer, pelican, pellet, pen, penalty, penance, pencil, pendulum, penguin, peninsula, penlight, pennant, penny, pension, pentagon, pentathlon, peony, people, pepper, percentage, perception, perch, perfection, performance, perfume, perimeter, period, periodical, periscope, perjury, permit, peroxide, perseverance, person, personality, personnel, perspective, pessimistic, petite, perfect, petty, philanthropic, pitiful, pleasant, plump, poised, polite, pompous, powerful, pragmatic, precious, pretentious, pretty, private, productive, professional, proud, psychotic, purposeful and pushy are words. They begin with the letter p. There are thousands of words that begin with p.
Polyhedron
plantation
passionate
perfection
pretension
protection
protrusive
population
proportion
precaution
prevention
pragmatist
prenuptial
proclivity
· pace
· pack
· pact
· pads
· page
· paid
· pail
· pain
· pair
· pale
· palm
· pane
· pang
· pans
· pant
· papa
· pare
· park
· pars
· part
· pass
· past
· pate
· path
· pave
· pawn
· pays
· peak
· peal
· pear
· peas
· peat
· peck
· peek
· peel
· peep
· peer
· pegs
· pelt
· pens
· perk
· perm
· peso
· pest
· pets
· pews
· pier
· pies
· pigs
· pike
· pine
· ping
· pink
· pins
· pint
· pipe
· pits
· pity
· plan
· play
· plea
· plod
· plop
· plow
· ploy
· plug
· plum
· plus
· pods
· poem
· poet
· poke
· poky
· pole
· poll
· polo
· pomp
· pond
· pony
· pool
· poor
· pope
· pork
· port
· post
· pots
· pour
· pout
· pray
· prep
· prom
· pros
· pubs
· puff
· pull
· pump
· punk
· punt
· pure
· push
· putt
Printers
parrot
Pulses
pensive
Pearl.
A piste
The opposite of ornate is plain.
Pneumonoultramicroscopicsilicovolcanoconiosis (also happens to be the longest word in the English language)
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.
The longest word starting with E is Electroencephalographically.
Scoop, Soup, and others, I'm not 100% sure about the rest though
Floccinaucinihilipilification is the longest word starting with F; it means the act of estimating something as worthless.
Youthfulness is the longest word starting with the letter Y. It contains twelve letters.
p-
Extraterritoriality is the longest word in the English language beginning with "ex."
Methionylthreonylthreonylglutaminylalanyl...isoleucine. It has 189819 letters and the longest word in the world.
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enormous