Skipjack :: Skipjack (n.) A shallow sailboat with a rectilinear or V-shaped cross section.
Slapjack :: Slapjack (n.) A flat batter cake cooked on a griddle; a flapjack; a griddlecake.
Smokejack :: Smokejack (n.) A contrivance for turning a spit by means of a fly or wheel moved by the current of ascending air in a chimney.
Supple-jack :: Supple-jack (n.) A climbing shrub (Berchemia volubilus) of the Southern United States, having a tough and pliable stem..