There are 642 10-letter words that start with 'in'.
Note: These 642 10-letter words that start with 'in' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with int, inc, ins, ind, inf, inv, ine, ina, inh, ing, inn, ino, ini, inj, ink, inu, inq, inb, inw, inl, inp, inr, inm.
3-letter words start with 'in' (3)