1. synergy the working together of two things to produce an effect
  2. sovereign a nation's ruler usually by hereditary right
  3. solar energy energy from the sun that is converted into thermal or electrical energy
  4. sevener the cardinal number that is the sum of six and one
  5. mass energy the mass of a body regarded relativistically as energy
  6. rest energy the energy equivalent to the mass of a particle at rest in an inertial frame of reference; equal to the rest mass times the square of the speed of light
  7. savoring taking a small amount into the mouth to test its quality
  8. free energy (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs
  9. energy forceful exertion
  10. waste of energy a useless effort
  11. souvenir something of sentimental value
  12. saving recovery or preservation from loss or danger
  13. heat energy a form of energy that is transferred by a difference in temperature
  14. psychic energy an actuating force or factor
  15. savouring taking a small amount into the mouth to test its quality
  16. skeen arch an arch whose height is less than half its width
  17. Savonarola Italian religious and political reformer
  18. seven iron iron with a lofted face for hitting high shots to the green
  19. skene arch an arch whose height is less than half its width
  20. suffrage a legal right to vote