There are 15 words that start with 'nine'.
nine | nines | ninety |
ninepin | ninebark | ninefold |
ninepins | nineteen | nineties |
ninebarks | nineteens | ninetieth |
nineteenth | ninetieths | nineteenths |
Note: These 15 words that start with 'nine' are found from the USA & Canada version of the tournament Scrabble word list.