There are 197 12-letter words that start with 'mi'.
Note: These 197 12-letter words that start with 'mi' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with mis, mic, mil, min, mid, mit, mir, mim, mig, mia, mix, mik, miz, mif, mio, mib, mie, mih, mij, miq, mip.
3-letter words start with 'mi' (9)