foso, m., ditch, moat.
fragmento, m., fragment, piece, bowlder.
fragoso, -a, craggy, rough, uneven.
fraguarse, to break; to be forged (invented or gotten up).
fraile, m., friar.
francamente, frankly.
franqueza, f., frankness.
frase, f., phrase, speech, word, words; —s enamoradas, tender (loving or lovesick) phrases (or words).
fratricida, fratricidal.
frecuente, frequent.