There are 18 words that start with 'ug'.
| ugh | ughs |
| ugly | uglier |
| uglies | uglify |
| uglily | ugsome |
| ugliest | uglified |
| uglifier | uglifies |
| ugliness | uglifiers |
| uglifying | uglinesses |
| uglification | uglifications |
Note: These 18 words that start with 'ug' are found from the USA & Canada version of the tournament Scrabble word list.