There are 11 words that start with 'postb'.
| postbag | postbox |
| postboy | postbags |
| postbase | postboys |
| postburn | postboxes |
| postbellum | postbiblical |
| postbourgeois | |
Note: These 11 words that start with 'postb' are found from the USA & Canada version of the tournament Scrabble word list.