You can make 169 valid words from the letters in CEIKPRS using the Scrabble US/CAN dictionary.
How many points is CEIKPRS worth in Scrabble?
CEIKPRS is worth 15 points in Scrabble (US/CAN) and 17 points in Words With Friends.
How do I use the Word Unscrambler tool?
Enter any letters into the input box and press Search. The tool will return every valid English word that can be made from those letters using the dictionary you select.