hurtend. but I'm not sure its a word.
None, unless you add some vowels.
centrifuge
forehead
Including the letters d, b, f, the longest word might be defibrillation.
"LANDFORMS"
An English word containing the letters 'a ,b ,c ,d ,e , and f is 'Fabricated' .
The letters "ou" make the "f" sound in the word "rough."
Just f makes the ffff sound, the other letters make up the first part of the word.
The missing letters F and C make the word deflects.
decaf
You can make the word defers using all of the letters.Other words that you can make using some of the letters are:DeersDeferFeedsFreedFreesReedsReefsRefedSederDreeFreeSeedSeer
be
folded toddle