foxhole

n hole in the ground dug by soldiers as a shelter against enemy fire and as a firing-point 散兵坑.

fountain-pen, four, four-, four-in-hand, four-letter word, four-ply, four-poster, four-square, four-wheel drive, fourfold, foursome, fourteen, fourteenth, fourth, fowl, fowl pest, fox, fox-hunting, fox-terrier, foxglove, foxhound, foxtrot, foxy, foyer, FPA, Fr, fracas, fraction, fractional, fractionally, fractious, fractiously, fractiousness, fracture, fragile, fragility, fragment, fragmentary, fragmentation, fragrance,