Some six letter words with FF in the middle are:
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5 nine letter words ending in FF:FlagstaffFoodstuffPikestaffPlaintiffWaitstaff
sniff snuff bluff gruff scoff
otto otto friend eat
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 4 words with the pattern -FF--C-. That is, seven letter words with 2nd letter F and 3rd letter F and 6th letter C. In alphabetical order, they are: afflict afforce efforce offence
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern W--FF-D. That is, seven letter words with 1st letter W and 4th letter F and 5th letter F and 7th letter D. In alphabetical order, they are: wauffed whiffed