There are 11 13-letter words that start with 'ven'.
| vendibilities | venerableness | 
| venipunctures | ventriloquial | 
| ventriloquies | ventriloquism | 
| ventriloquist | ventriloquize | 
| ventrolateral | venturesomely | 
| venturousness | |
Note: These 11 13-letter words that start with 'ven' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with vent, vene, vend, veno, veni, vena, veng, venu.
4-letter words start with 'ven' (3)