There are 13 11-letter words that start with 'sou'.
| soubriquets | soulfulness | soundalikes |
| soundboards | soundlessly | soundnesses |
| soundproofs | soundstages | sourcebooks |
| sousaphones | southeaster | southerlies |
| southwester | ||
Note: These 13 11-letter words that start with 'sou' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with sout, sour, soun, soul, soup, sous, soub, souv, soug, souc, souf, souk, soua, soud.
4-letter words start with 'sou' (5)