There are 13 words that start with 'overwa'.
| overwarm | overwary | overwarms |
| overwatch | overwater | overwarmed |
| overwaters | overwarming | overwatched |
| overwatches | overwatered | overwatching |
| overwatering | ||
Note: These 13 words that start with 'overwa' are found from the USA & Canada version of the tournament Scrabble word list.