There are 12 words that start with 'outso'.
| outsoar | outsold | outsole |
| outsoars | outsoles | outsoared |
| outsource | outsoaring | outsourced |
| outsources | outsourcing | outsourcings |
Note: These 12 words that start with 'outso' are found from the USA & Canada version of the tournament Scrabble word list.