Wee,key,and fee
"Purposeful" rhymes with peaceful and starts with the letter "p".
callin :P
intern :P
Parallelogram ;P
Plumkin is a made-up word that rhymes with pumpkin and starts with the P sound.
Butter :P
pound
peas There is also "pleas" as in "The helpless villagers cried pleas for help."
perm
ping-pong =P
pail
Uh uh BEN P:):)