You can make 282 valid words from the letters in FOSSILIZED using the Scrabble US/CAN dictionary.
How many points is FOSSILIZED worth in Scrabble?
FOSSILIZED is worth 23 points in Scrabble (US/CAN) and 24 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.