ELF - A mythical, supernatural being resembling but seen as distinct from humans.
FEE - Cattle; livestock, especially considered as the basis of wealth.
FLU - Influenza.
FUR - Hairy coat of various mammal species, especially: when fine, soft and thick.
RUE - Repentance, regret.
EEL - Any fish of the order Anguilliformes which are elongated and resemble snakes. There are freshwater and marine species.
REF - Referee.
FEEL - To become aware of through the skin; to use the sense of touch.
FLEE - To run away; to escape.
FREE - Not imprisoned or enslaved.
FUEL - Substance consumed to provide energy through combustion, or through chemical or nuclear reaction.
LURE - Something that tempts or attracts, especially one with a promise of reward or pleasure.
REEF - Scabby; scurvy.
REEL - A lively dance of the Highlanders of Scotland; also, the music to the dance; -- often called Scotch reel.
RULE - A regulation, law, guideline.
LEER - A significant side glance; a glance expressive of some passion, as malignity, amorousness, etc.; a sly or lecherous look.
FLUE - A pipe or duct that carries gaseous combustion products away from the point of combustion (such as a furnace).
REFUEL - To refill with fuel.