There are 16 words that start with 'trium'.
| triumph | triumphs |
| triumvir | triumphal |
| triumphed | triumviri |
| triumvirs | triumphant |
| triumphing | triumvirate |
| triumphalism | triumphalist |
| triumphantly | triumvirates |
| triumphalisms | triumphalists |
Note: These 16 words that start with 'trium' are found from the USA & Canada version of the tournament Scrabble word list.