There are 15 words that start with 'theori'.
| theories | theorise |
| theorist | theorize |
| theorised | theorises |
| theorists | theorized |
| theorizer | theorizes |
| theorising | theorizers |
| theorizing | theorization |
| theorizations | |
Note: These 15 words that start with 'theori' are found from the USA & Canada version of the tournament Scrabble word list.