According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 8 words with the pattern ---FEI---. That is, nine letter words with 4th letter F and 5th letter E and 6th letter I. In alphabetical order, they are:
caffeines
caffeinic
caffeisms
forfeited
forfeiter
misfeigns
surfeited
surfeiter