friv·ol 
(frĭvəl)
(frĭvəl)intr.v. friv·oled, friv·ol·ing, friv·ols or friv·olled or friv·ol·ling
To behave frivolously.
[Back-formation from FRIVOLOUS.]
frivol·er n.
- play possum
- playroom
- playsuit
- play the devil with
- play the field
- play the fool
- play the game
- play therapist
- play therapy
- plaything
- play up
- play upon
- play up to
- playwear
- play with
- play with a full deck
- play with fire
- play with (oneself)
- play with oneself
- playwright
- playwrighting
- playwriting
- play yard
- plaza
- plea