There are 8 words that start with 'unob'.
| unobserved | unobtrusive |
| unobservable | unobstructed |
| unobtainable | unobtrusively |
| unobjectionable | unobtrusiveness |
Note: These 8 words that start with 'unob' are found from the USA & Canada version of the tournament Scrabble word list.