There are 12 words that end with 'enths'.
tenths | dozenths | greenths |
sevenths | elevenths | fifteenths |
sixteenths | eighteenths | fourteenths |
nineteenths | thirteenths | seventeenths |
Note: These 12 words that end with 'enths' are found from the USA & Canada version of the tournament Scrabble word list.