There are 12 words that start with 'matric'.
| matrices | matricide | 
| matricidal | matricides | 
| matriculant | matriculate | 
| matriculants | matriculated | 
| matriculates | matriculating | 
| matriculation | matriculations | 
Note: These 12 words that start with 'matric' are found from the USA & Canada version of the tournament Scrabble word list.