There are 18 words that start with 'asto'.
| astony | astound |
| astomous | astonied |
| astonies | astonish |
| astounds | astomatal |
| astonying | astounded |
| astonished | astonishes |
| astounding | astonishing |
| astonishment | astoundingly |
| astonishingly | astonishments |
Note: These 18 words that start with 'asto' are found from the USA & Canada version of the tournament Scrabble word list.