Breakup, catchup, cup, getup, grownup, hiccup, layup, makeup and pinup are words. They end with UP.
The curse word that starts with "p" and ends in "k" is likely "prick."
atop
Penmanship
Penmanship
A word called propitiatory
lollipop
pizzazz.
pill
salesmanshipscallopscholarshipsharpsheepshipshortstopsitupskipskycapsleepslumpsnowdropsoapsoupspaceshipsponsorshipstampsteamshipstepstickupstopstrapstripstumpswampsweepsyrup
Pies
PAULA?
picnic for one