There is no 7-letter word using those letters, but there are two 6-letter options:
freebie
falloff
playoff
Herself.
There is no single English word that meets the criteria, but you can make these 7-letter words if you repeat some of the letters. abfarad, affably, alfalfa, arrayal, falbala, faraday
FalloffFar-offFlyleaf
finding?
I assume that is 7 correct out of 8. That would be a B. If it is 7 wrong it is an F.
flyleaf
Fusspot.
* bluff * brief
I think its Failure