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