el forro - cover of a book, lining of clothing,...
  la franela - flannel
  la fila - line or row (of objects or people)
  la fotogenia - photogenic quality or qualities
  la furgoneta - van, delivery truck, station wagon
  la foca - seal (animal)
  la fresa - strawberry; a tool that is shaped...
  fehaciente - reliable, irrefutable, dependable,...
  felino - catlike, feline, having to do with cats
  falaz - false
  (el) fulano, (la) fulana - what\'s-his-name, what\'s-her-name,...
  la funda - a covering, a case used to cover or...
  el fregadero - sink (as in a kitchen)
  el foso - ditch, moat (as around a castle),...
  feroz - fierce, ferocious, cruel, terrible
  el fagot - bassoon
  frondoso - leafy, luxuriant
  la fábrica - factory, manufacturing or processing...
  el flan - flan (a type of Spanish custard often...
  el fósil - fossil