There are 15 words that start with 'theatr'.
| theatre | theatres |
| theatric | theatrics |
| theatrical | theatricals |
| theatrically | theatricalism |
| theatricality | theatricalize |
| theatricalisms | theatricalized |
| theatricalizes | theatricalities |
| theatricalizing | |
Note: These 15 words that start with 'theatr' are found from the USA & Canada version of the tournament Scrabble word list.