There are 16 13-letter words that start with 'ree'.
Note: These 16 13-letter words that start with 'ree' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with reen, reex, reem, reed, reel, rees, reev, reef, reek, reec, reeq, reea, reej, reer.
4-letter words start with 'ree' (5)