Faked or fraud.
Fumes are a synonym for gas.
Finish is another word for completion starting with the letter F.
lens opening; lens diaphragm some might suggest F-Stop
Florsheim
Forerunner is a synonym for leader. It begins with the letter F.
the synonym of ride can be to drive or to f***.
Fossil is a synonym of old and antique and begins with an F.
Check an online thesaurus (like thesaurus.com) using Control-F (Find) key (spacebar-k).
Faked or fraud.
Friend
enemy
frugal
faint?foggy?
footstep is a synonym for pace
Fumes are a synonym for gas.
Fantastic or Fashionable can be a compliment starting with letter F.