There are 12 words that start with 'venti'.
| venting | ventifact | ventilate | 
| ventifacts | ventilated | ventilates | 
| ventilator | ventilating | ventilation | 
| ventilators | ventilatory | ventilations | 
Note: These 12 words that start with 'venti' are found from the USA & Canada version of the tournament Scrabble word list.