some words include:
pabulums
pachadom
pachalic
pachinko
pachisis
pachouli
pachucos
pacified
pacifier
pacifies
pacifism
pacifist
packable
a full list of words beginning with P containing 8 letters can be found here (see related links), although this list doesn't include every 8 letter word containing the letter P.
lollipop
Some eight letter words that start with B and end with P are:backdropbackstopbookshopbullwhip
poignant
township
township
Clippers (LA)
g for greeting p for pleasing
township
pancakes pancetta
An eight letter word is pretends.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern P--P-P-E. That is, eight letter words with 1st letter P and 4th letter P and 6th letter P and 8th letter E. In alphabetical order, they are: prepupae
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern P-P---IP. That is, eight letter words with 1st letter P and 3rd letter P and 7th letter I and 8th letter P. In alphabetical order, they are: popeship