There are 49 12-letter words that start with 'hyper'.
Note: These 49 12-letter words that start with 'hyper' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with hyperp, hyperc, hyperm, hypers, hypere, hypert, hyperb, hypera, hyperi, hyperr, hypero, hyperv, hyperg, hyperl, hyperk, hyperf, hyperu, hyperh.
6-letter words start with 'hyper' (1)