Siamese cat
slug
A Sock.
Waist coat
Excessive sweat.
school diploma
huge shotguns
Second birthday.
Some three letter words starting with "s" are:sacsadsagsapsatsawsayseaseesetsewsexsheshysinsipsirsitsixslysobsodsonsopsotsowsoyspaspystysuesumsun
CAT scan. Coughing seniors.
All I can think of is "seance collaborator."
Some four letter words starting with S and ending with F are:selfserfsurf
Giant scythe (i.e., when death takes a holiday).