Laughter unites people.

Meaning: This means that laughter can help to bring people together and create a sense of unity. It suggests that laughter can be a way of breaking down barriers and creating positive social connections.

Choice of Words: Laughter is a noun that refers to the act of laughing. Unites is the third person singular present tense of the verb 'to unite', which means to bring together or to combine into a single entity. People is a plural noun that refers to human beings.