zapp
D: Deep P: Puffy O: Open U:Ugly
papaw, pilaw, pshaw
pen prison present phenomenon passion possession
phlox parallax chicken pox pix phalanx
There's only 1! - "PLUMB"
plow
Keep and kelp are four letter words starting with K and ending with P.
pulp prop
Pregnant :P
Words starting with R and ending with P are:raindropreceivershipramprapraspreaprecaprecouprelationshipripromprump
turnip parsnips