There are 9 10-letter words that start with 'hoo'.
| hoodedness | hoodlumish | hoodlumism | 
| hoodooisms | hoodwinked | hoodwinker | 
| hoofprints | hoopskirts | hootenanny | 
Note: These 9 10-letter words that start with 'hoo' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with hood, hook, hoop, hoof, hoot, hoor, hool, hoov, hooc, hoos, hooe.
4-letter words start with 'hoo' (5)