There are 36 9-letter words that start with 'sli'.
Note: These 36 9-letter words that start with 'sli' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with slip, slic, slim, slin, slit, slig, slid, sliv, slie, slil.
4-letter words start with 'sli' (4)