What is it called when the ball carrier loses possession of the ball?

What is an onside kick? What is the name for a defensive play where extra rushers go after the quarterback? What is the term for a quarterback running the ball himself on a short-yardage push? What is a "flea flicker"? Which player holds the NFL record for most career passing yards? Which player holds the NFL record for most career rushing yards? Which player holds the NFL record for most career receiving yards? Which player holds the NFL record for most career touchdowns?