There are 14 words that start with 'horo'.
| horologe | horology | horologer |
| horologes | horologic | horoscope |
| horoscopy | horologers | horologies |
| horologist | horoscopes | horological |
| horologists | horoscopies | |
Note: These 14 words that start with 'horo' are found from the USA & Canada version of the tournament Scrabble word list.