There are 17 words that start with 'viva'.
| viva | vivas | 
| vivace | vivary | 
| vivaces | vivaria | 
| vivacity | vivaries | 
| vivarium | vivacious | 
| vivariums | vivacities | 
| vivandiere | vivaciously | 
| vivandieres | vivaciousness | 
| vivaciousnesses | |
Note: These 17 words that start with 'viva' are found from the USA & Canada version of the tournament Scrabble word list.