There are 16 words that start with 'rosi'.
| rosin | rosier | rosily | 
| rosing | rosins | rosiny | 
| rosiest | rosined | rosinol | 
| rosiness | rosining | rosinols | 
| rosinous | rosinweed | rosinesses | 
| rosinweeds | ||
Note: These 16 words that start with 'rosi' are found from the USA & Canada version of the tournament Scrabble word list.