There are 14 words that start with 'comba'.
| combat | combats | 
| combated | combater | 
| combatant | combaters | 
| combating | combative | 
| combatted | combatants | 
| combatting | combatively | 
| combativeness | combativenesses | 
Note: These 14 words that start with 'comba' are found from the USA & Canada version of the tournament Scrabble word list.