1. flat coat the first or preliminary coat of paint or size applied to a surface
  2. flatboat a flatbottom boat for carrying heavy loads
  3. flat out at top speed
  4. flatfoot a foot afflicted with a fallen arch
  5. flat-hat fly very close to the ground
  6. flat cap a flat woolen cap with a stiff peak
  7. flatcar freight car without permanent sides or roof
  8. floodgate a valve that controls the flow of water
  9. wild goat undomesticated goat
  10. flat knot a square knot used in a reef line
  11. wildcat any small or medium-sized cat resembling the domestic cat and living in the wild
  12. flake out change from a waking to a sleeping state
  13. flatmate an associate who shares an apartment with you
  14. flathead food fish of the Indonesian region of the Pacific
  15. flatlet a tiny flat
  16. flatten out become flat or flatter
  17. waistcoat a sleeveless garment worn under a jacket and over a shirt
  18. fluctuate move or sway in a rising and falling or wavelike pattern
  19. flattened having been flattened
  20. flautist someone who plays the flute