There are 12 words that start with 'outgro'.
| outgrow | outgross | outgroup |
| outgrown | outgrows | outgroups |
| outgrowth | outgrossed | outgrosses |
| outgrowing | outgrowths | outgrossing |
Note: These 12 words that start with 'outgro' are found from the USA & Canada version of the tournament Scrabble word list.