There are 15 words that start with 'regio'.
| region | regions |
| regional | regionals |
| regionally | regionalism |
| regionalist | regionalize |
| regionalisms | regionalists |
| regionalized | regionalizes |
| regionalistic | regionalizing |
| regionalization | |
Note: These 15 words that start with 'regio' are found from the USA & Canada version of the tournament Scrabble word list.