fountain-pen

n pen with a container from which ink flows continuously to the nib 自来水笔.

fought, foul, foul play, foul-mouthed, foul-up, foully, foulness, found, foundation, foundation course, foundation-stone, foundations, founder, founder-member, founding father, foundling, foundry, fount, fountain, fountain-head, 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, foxhole,