la gomina - gel (especially hair gel)
  el germen - germ (in most usages)
  la granada - pomegranate, grenade
  el glaciar - glacier
  la falocracia - male chauvinism, male-centered...
  el ferrocarril - railroad, railway, train
  fullero - cheating, dishonest, deceptive,...
  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)