There are 88 13-letter words that start with 'super'.
Note: These 88 13-letter words that start with 'super' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with supers, superc, supera, superp, superi, superh, superf, supere, superm, supern, superl, superb, superv, superg, supero, supert, superr, superw, superj, superd, superq.
6-letter words start with 'super' (2)