According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 6 words with the pattern PAT--I---. That is, nine letter words with 1st letter P and 2nd letter A and 3rd letter T and 6th letter I. In alphabetical order, they are:
patchiest
patchings
patinised
patinises
patinized
patinizes