Words with the S sound in the BEGINNING of words http://www.quia.com/mc/331242.html
Words with the S sound in the MIDDLE of words http://www.quia.com/mc/335071.html
Words with the S sound at the END of words http://www.quia.com/jg/331583.html
The Jumbo Articulation Book of Sounds - ask your Speech teacher for this book