There are 12 words that start with 'stagn'.
| stagnant | stagnate | stagnance | 
| stagnancy | stagnated | stagnates | 
| stagnances | stagnantly | stagnating | 
| stagnation | stagnancies | stagnations | 
Note: These 12 words that start with 'stagn' are found from the USA & Canada version of the tournament Scrabble word list.