There are 42 13-letter words that start with 'unc'.
Note: These 42 13-letter words that start with 'unc' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with unco, uncl, unch, unca, uncr, uncu, unci, unce, unct, uncy.
4-letter words start with 'unc' (2)