What's the word for laughter?

Hello, the words can be composed of: hold, joke, smiling face, laugh, grin, smiling tiger, laugh, laugh off the big teeth, laugh often, hide the knife in the smile, daughter laugh, joke, laugh, laugh, laugh.

Laughter is a peaceful state of mind, a kind inner expression, and it is also the time when endorphin secretion increases in the body. When a person's mood is in a normal state, he will show a peaceful psychological effect in the conversation with others, and show the goodwill communication between people with a smile. Good and evil is the psychological function of human beings and the result of primate evolution. Laugh: Show a happy expression and make a joyful sound.