There are 16 words that start with 'upw'.
| upwaft | upward | upwell |
| upwind | upwafts | upwards |
| upwells | upwinds | upwafted |
| upwardly | upwelled | upwafting |
| upwelling | upwardness | upwellings |
| upwardnesses | ||
Note: These 16 words that start with 'upw' are found from the USA & Canada version of the tournament Scrabble word list.