frolic

n [sing] lively and enjoyable activity 欢乐的活动: having a frolic in the garden 在花园里开游乐会.

Frisbee, frisk, friskily, frisky, frisson, fritter, frivolity, frivolous, frivolously, frizz, frizzle, frizzy, fro, frock, frock coat, frock-coat, frog, frog-march, frog-spawn, frogman, frolicsome, from, from memory, from now on, from side to side, from then on, from time to time, from...to, frond, front, front man, front runner, front-page, frontage, frontal, frontier, frontiersman, frontispiece, frost, frost-bite,