faceoff

noun
  1. a direct confrontation between two people or groups.
    last night's vice presidential face-off

faff

verb
  1. spend time in ineffectual activity.
    we can't faff around forever
noun
  1. a great deal of ineffectual
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failproof

Resistant to failure.

falloff

noun

A reduction or decline.

feedstuff

noun
  1. a food provided for cattle and other livestock.
    agricultural feedstuffs for pigs and cattle

fief

noun
  1. An estate held by a person on condition of providing military service to a superior.
  2. Something over
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fireproof

adjective
  1. able to withstand fire or great heat.
    a fireproof dish
verb
  1. make (something) fireproof.
    nearby
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fisticuff

A blow to someone or something with the fist.