There are 7 13-letter words that start with 'mou'.
| mountainously | mountainsides |
| mountebankery | mountebanking |
| mousetrapping | mouthbreeders |
| mouthwatering | |
Note: These 7 13-letter words that start with 'mou' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with mous, moun, mout, moul, mour, mouc, mouf, moue, mouj, moui.
4-letter words start with 'mou' (1)