There are 15 words that start with 'curve'.
| curve | curved | curves | 
| curvet | curvey | curvets | 
| curvedly | curveted | curveball | 
| curveting | curvetted | curveballs | 
| curvetting | curveballed | curveballing | 
Note: These 15 words that start with 'curve' are found from the USA & Canada version of the tournament Scrabble word list.