ELF - A mythical, supernatural being resembling but seen as distinct from humans.
FLU - Influenza.
FUR - Hairy coat of various mammal species, especially: when fine, soft and thick.
RUT - Sexual desire or oestrus of cattle, and various other mammals.
RUE - Repentance, regret.
REF - Referee.
FELT - A cloth or stuff made of matted fibres of wool, or wool and fur, fulled or wrought into a compact substance by rolling and pressure, with lees or size, without spinning or weaving.
FUEL - Substance consumed to provide energy through combustion, or through chemical or nuclear reaction.
LEFT - The opposite of right; toward the west when one is facing north.
LURE - Something that tempts or attracts, especially one with a promise of reward or pleasure.
RULE - A regulation, law, guideline.
TRUE - Conforming to the actual state of reality or fact; factually correct.
FRET - A fog or mist at sea or coming inland from the sea.
LUTE - A fretted stringed instrument, similar to a guitar, having a bowl-shaped body or soundbox.
FLUE - A pipe or duct that carries gaseous combustion products away from the point of combustion (such as a furnace).
TUFT - A bunch of feathers, grass or hair, etc., held together at the base.
FLUTE - A woodwind instrument consisting of a metal, wood or bamboo tube with a row of circular holes and played by blowing across a hole in the side of one end or through a narrow channel at one end against a sharp edge, while covering none, some or all of the holes with the fingers to vary the note played.
UTTER - To say.
TURTLE - Any land or marine reptile of the order Testudines, characterised by a protective shell enclosing its body.
FLUTTER - To flap or wave quickly but irregularly.