1. fail-safe eliminating danger by compensating automatically for a failure or malfunction
  2. philosophy the rational investigation of existence and knowledge
  3. philosophise reason philosophically
  4. false face a mask worn as part of a masquerade costume
  5. philosophize conduct rational investigation
  6. falsify make false by mutilation or addition
  7. falseness the state of being false or untrue
  8. falsifier someone who falsifies
  9. full-face looking forward
  10. philosopher a specialist in the investigation of existence and knowledge
  11. felicitous exhibiting an agreeably appropriate manner or style
  12. fallacy a misconception resulting from incorrect reasoning
  13. falafel fried croquette of mashed chickpeas and spices
  14. philosophizer someone who considers situations from a philosophical point of view
  15. philosophiser someone who considers situations from a philosophical point of view
  16. blasphemy profane language
  17. Filicales true (leptosporangiate) ferns
  18. facilitate make easier
  19. philosophic of or relating to philosophy or philosophers
  20. class Aves (ornithology) the class of birds