There are 13 words that start with 'supi'.
| supine | supines | supinate |
| supinely | supinated | supinates |
| supinator | supinating | supination |
| supinators | supineness | supinations |
| supinenesses | ||
Note: These 13 words that start with 'supi' are found from the USA & Canada version of the tournament Scrabble word list.