There are 9 10-letter words that start with 'sni'.
| snickerers | snickering | sniffiness | 
| sniffishly | sniggerers | sniggering | 
| snippetier | snivellers | snivelling | 
Note: These 9 10-letter words that start with 'sni' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with snif, snip, snig, snic, sniv, snit, snid, snib.
4-letter words start with 'sni' (3)