four
adj., n one more than three; 4; IV

play
vi. 1. to move lightly, rapidly 2. to engage in recreation 3. take part in a game or sport 4. to trifle 5. to perform on a musical instrument 6. to give out sounds 7. to act in a specified way 8. to act in a drama 9. to impose unscrupulously - vt. 1. to take part in 2. to oppose 3. to do, as in fun 4. to bet on 5. to cause to move 6. to cause/to play havoc

FOURplay
n everything listed under play x four