There are 14 words that start with 'stupe'.
| stupe | stupes | 
| stupefy | stupefied | 
| stupefier | stupefies | 
| stupefiers | stupefying | 
| stupendous | stupefaction | 
| stupefyingly | stupendously | 
| stupefactions | stupendousness | 
Note: These 14 words that start with 'stupe' are found from the USA & Canada version of the tournament Scrabble word list.