Definitions of interchange:

• noun:   mutual interaction; the activity of interchanging or reciprocating
• noun:   a junction of highways on different levels that permits traffic to move from one to another without crossing traffic streams
• noun:   reciprocal transfer of equivalent sums of money especially the currencies of different countries

  Example: "He earns his living from the interchange of currency"

• verb:   reverse (a direction, attitude, or course of action)
• verb:   give to, and receive from, one another
• verb:   cause to change places

  Example: "Interchange this screw for one of a smaller size"