Laugh
Part of speech: noun
Definition: An expression of mirth particular to the human species; the sound heard in laughing; laughter. Something that provokes mirth or scorn.
Part of speech: verb
Definition: To show mirth, satisfaction, or derision, by peculiar movement of the muscles of the face, particularly of the mouth, causing a lighting up of the face and eyes, and usually accompanied by the emission of explosive or chuckling sounds from the chest and throat; to indulge in laughter. To be or appear cheerful, pleasant, mirthful, lively, or brilliant; to sparkle; to sport. To laugh at, to make an object of laughter or ridicule; to make fun of; to deride. To affect or influence by means of laughter or ridicule. To express by, or utter with, laughter; — with out.
Smile
Part of speech: noun
Definition: A happy face expression using mouth, but without producing voice.
Part of speech: verb
Definition: To make a small happy face expression using mouth, (without sound.)
Example sentence: Smile, it's free therapy.