Mammoth Uncensored Word List:
41 words ending with ws, 4 letters long

bows caws cows daws dews dows faws haws hews hows jaws jews jows kaws kows laws lows maws mews mows news nows paws pews pows raws rews rows saws sews sows taws tews tows vaws vows waws wows yaws yews yows