There are 14 11-letter words that start with 'mor'.
| moratoriums | morbidities | mordacities | 
| moribundity | moronically | morphactins | 
| morphinisms | morphogenic | morphologic | 
| morphometry | mortadellas | mortalities | 
| mortarboard | morulations | |
Note: These 14 11-letter words that start with 'mor' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with mort, morp, mora, moro, more, mord, morg, morb, morr, mors, moru, mori, morn, morc.
4-letter words start with 'mor' (5)