There are 14 words that start with 'stren'.
| strength | strengths |
| strenuous | strengthen |
| strengthens | strenuosity |
| strenuously | strengthened |
| strengthener | strengtheners |
| strengthening | strenuosities |
| strenuousness | strenuousnesses |
Note: These 14 words that start with 'stren' are found from the USA & Canada version of the tournament Scrabble word list.