Penny (or if more than one it is called pence).
Pot
P
boat
Demand
d is to B as r is to P
neater is to tidier as messier is to sloppier
The Kingdom of Plants starts with p.
in your rather large but crack :p
200 cents :P
Potatoes are veggies. Potato starts with p. :)
The horse gait that starts with a 'p' is called Piaffe.
A basketball term that starts with P is pass.