There are 208 13-letter words that start with 'non'.
Note: These 208 13-letter words that start with 'non' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with nonc, nons, nona, nonp, none, nond, noni, nonr, nonm, nonf, nonb, nont, nonl, nonv, nonh, nono, nong, nonn, nonu, nonw, nonj, nonq, nony, nonk, nonz.
4-letter words start with 'non' (2)