There are 13 words that start with 'oest'.
| oestrin | oestrum | oestrus |
| oestrins | oestriol | oestrone |
| oestrous | oestrums | oestriols |
| oestrogen | oestrones | oestruses |
| oestrogens | ||
Note: These 13 words that start with 'oest' are found from the USA & Canada version of the tournament Scrabble word list.