There are 8 11-letter words that start with 'moo'.
| moodinesses | moonflowers | mooninesses | 
| moonlighted | moonlighter | moonshiners | 
| moonshining | moonwalking | |
Note: These 8 11-letter words that start with 'moo' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with moon, moor, mood, mool, moot, mooc, moos, mooe, mooi.
4-letter words start with 'moo' (6)