UPWAFT
UPWAFTED
UPWAFTING
UPWAFTS
UPWARD
UPWARDLY
UPWARDNESS
UPWARDNESSES
UPWARDS
UPWELL
UPWELLED
UPWELLING
UPWELLINGS
UPWELLS
UPWENT
UPWHIRL
UPWHIRLED
UPWHIRLING
UPWHIRLS
UPWIND
UPWINDING
UPWINDS
UPWOUND
UPWRAP
UPWRAPS
UPWROUGHT

26 words start with UPW.