F4O1S1S1I1L1I1S1E1
12 points
FOSSILISE is validvalid
to fossilize [v FOSSILISED, FOSSILISES, FOSSILISING]
to turn into a fossil, also FOSSILIZE [v FOSSILISED, FOSSILISING, FOSSILISES]
to fossilize [v FOSSILISED, FOSSILISES, FOSSILISING]
to turn into a fossil, also FOSSILIZE [v FOSSILISED, FOSSILISING, FOSSILISES]