scallop, schlepp, schlump, scollop, screwup, shakeup, shallop, shapeup,
shiplap, smashup, snowcap, sonship, soursop, speedup, stackup, standup,
startup, stickup, stirrup, stopgap, sunlamp, syncarp,

Source:
http://letterword.com/index.php/seven-letter-words-starting-with-s-and-e...