floss

n [U] 1 rough silk threads from the outside of a silkworm's cocoon （蚕茧外层的）粗丝. 2 (also 'floss silk) spun (but not twisted) silk thread used for embroidery 刺绣用的丝线.

flooding, floodlight, floor, floor show, floor-board, flooring, floozie (also floosie), flop, flop-house, floppy, flora, floral, Florence, Florence Nightingale, Florentine, florid, Florida, floridness, florin, florist, flotation, flotilla, flotsam, flounce, flounced, flounder, flour, flourish, floury, flout, flow, flow chart (also flow diagram), flower, flower children (also flower people), flower power, flower-bed, flower-girl, flower-show, flowered, flowering,