Fer, _for_.
Ferfle, ferful, _fearful_;
also an intensive.
Fin', _find_.
Fish-skin, used in New England to clarify coffee.
Fix, _a difficulty_, _a nonplus_.
Foller, folly, _to follow_.
Forrerd, _forward_.
Frum, _from_.
Fur, _far_.
Furder, _farther_.
Furrer, _furrow_.
Metaphorically, _to draw a straight furrow_ is to live uprightly
or decorously.
Fust, _first_.