From Teflpedia

Pictionary (/ˈpɪkʃənəri/) is the name of a game, inspired by charades, in which a player has to draw a picture representing a word or phrase, whilst her team-mates have to try to guess the word.

Note: Pictionary is a trade mark owned by Hasbro and to be safe legally-speaking it should refer specifically only to the boxed game.

Teachers can use a Pictionary-inspired game, let's call it "drawing charades" (/drɔ:rɪŋg ʃəreɪdz/) in the classroom.