UPFIELD
UPFILL
UPFILLED
UPFILLING
UPFILLINGS
UPFILLS
UPFLASHING
UPFLING
UPFLINGING
UPFLINGS
UPFLOW
UPFLOWED
UPFLOWING
UPFLOWS
UPFLUNG
UPFOLD
UPFOLDED
UPFOLDING
UPFOLDS
UPFOLLOW
UPFOLLOWED
UPFOLLOWING
UPFOLLOWS
UPFRONT
UPFURL
UPFURLED
UPFURLING
UPFURLS

28 words start with UPF.