There are 15 words that start with 'posth'.
| postheat | posthole |
| posthaste | postheats |
| postholes | posthastes |
| posthumous | postharvest |
| postholiday | posthospital |
| posthumously | posthypnotic |
| postholocaust | posthumousness |
| posthemorrhagic | |
Note: These 15 words that start with 'posth' are found from the USA & Canada version of the tournament Scrabble word list.