There are 18 words that start with 'grass'.
| grass | grassy | grassed |
| grasses | grassier | grassily |
| grassing | grassiest | grassland |
| grassless | grasslike | grassplot |
| grassroot | grasslands | grassplots |
| grassroots | grasshopper | grasshoppers |
Note: These 18 words that start with 'grass' are found from the USA & Canada version of the tournament Scrabble word list.