There are 565 5-letter words starting with P in the ENABLE dictionary — 7% of all 8,636 words at this length. P is a one-point tile, so the value in this list is positional rather than numerical — which of these you can play depends far more on where it fits the board than on what it scores.
The list divides into 10 groups by second letter, the largest being the 119 words with pa. Scanning the right group is faster than reading the whole list, which is why it is broken up below rather than run alphabetically.
If you know more than one letter, this page stops being the fast way to find it. Enter what you have in the unscrambler — the Contains, Starts with and Ends with filters combine, and setting both length fields to 5 narrows this list to the handful your letters actually allow.
All 565 words, by second letter
PA… (119)
pacas paced pacer paces pacha packs pacts paddy padis padle padre padri paean paeon pagan paged pager pages pagod paiks pails pains paint pairs paisa paise palea paled paler pales palet palls pally palms palmy palpi palps palsy pampa panda pandy paned panel panes panga pangs panic panne pansy panto pants panty papal papas papaw paper pappi pappy paras parch pardi pards pardy pared pareo parer pares pareu parge pargo paris parka parks parle parol parrs parry parse parts party parve parvo paseo pases pasha passe pasta paste pasts pasty patch pated paten pater pates paths patin patio patly patsy patty pause pavan paved paver paves pavid pavin pavis pawed pawer pawky pawls pawns paxes payed payee payer payor