There are 8 words that start with 'polyd'.
| polydactyl | polydipsia | 
| polydipsic | polydactyly | 
| polydipsias | polydisperse | 
| polydactylies | polydispersity | 
Note: These 8 words that start with 'polyd' are found from the USA & Canada version of the tournament Scrabble word list.