快乐

happy; up; gay; glad; jolly; joyful; cheerful; delighted; merry; blissful; pleased; gaiety; happily; joyfully; cheerfully; gaily; merrily; happiness; joy; pleasure; fun; cheer; delight; enjoyment; cheerfulness; merriment; felicity; gladness; enjoy; entertain; rejoice; gladden; with pleasure

开心

happy; joyful; glad; delighted; pleased; elated; cheerful; merry; overjoyed; thrilled; joyous; feel happy; joy; delight; pleasure; amuse; rejoice; make fun of; tickle; happiness; cheerfulness; amusement; mirth; gladness; happily; joyfully; cheerfully; with pleasure; with delight