There are 22 10-letter words that start with 'flu'.
Note: These 22 10-letter words that start with 'flu' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with fluo, flui, flut, flus, flum, flun, fluf, flue, fluk, flux, flub, fluc, flug, flur, flup, fluv, fluy.
4-letter words start with 'flu' (4)