There are 11 words that start with 'phlo'.
| phlox | phloem | phloems | 
| phloxes | phlorizin | phlogistic | 
| phlogiston | phlogopite | phlorizins | 
| phlogistons | phlogopites | |
Note: These 11 words that start with 'phlo' are found from the USA & Canada version of the tournament Scrabble word list.