leap..
snap..
pump..
Keep and kelp are four letter words starting with K and ending with P.
pour
plaza
scrip
open
pump
Some four letter words beginning with P and ending with S:PadsPalsPansPapsParsPassPatsPawsPaysPeasPecsPegsPensPepsPetsPewsPicsPiesPigsPinsPipsPitsPlusPodsPolsPomsPopsPotsProsPubsPudsPugsPunsPupsPuts
Keep and kelp are four letter words starting with K and ending with P.
weep
phiz. prez. putz.
pour
Battleship
dolllop. =\
up
bishop
tulip
limp