There are 10 words that start with 'obn'.
| obnoxious | obnubilate |
| obnoxiously | obnubilated |
| obnubilates | obnubilating |
| obnubilation | obnoxiousness |
| obnubilations | obnoxiousnesses |
Note: These 10 words that start with 'obn' are found from the USA & Canada version of the tournament Scrabble word list.