fake
Four letter adjectives that begin with the letter f:fairfakefastfinefiveflatfoulfourfreefull
flying
fundamental
Forsooth
fiendishfrenziedfrighteningfrenetic
friendly
Some four letter words with the first letter f are:facefadefailfairfallfamefarmfastfearfeedfeelfeetfestfilefillfilmfinefirefirmfishfistflapflatflewflitflipflitflopfluefoalfoamfoldfolkfoodfoolfootforkformfortfourfrayfreefretfromfuelfullfumefuryfussfuzz
Fog is a weather related word. It begins with the letter f.
fluid
Forlorn
FalloffFar-offFlyleaf
Some presentations are funny. It begins with the letter f.