interchange

Concise Oxford English Dictionary © 2008 Oxford University Press:
interchange

▶verb /ɪntəˈtʃeɪn(d)ʒ/ (of people) exchange (things) with each other.

■ put each of (two things) in the other's place.

▶noun /ˈɪntətʃeɪn(d)ʒ/ 

• 1 the action of interchanging.

  ■ an exchange of words.

• 2 alternation: the interchange of woods and meadows.

• 3 a road junction on several levels so that traffic streams do not intersect.

• 4 a station where passengers may change from one railway line or bus service to another.

– derivatives
interchangeability noun,
interchangeable adjective,
interchangeableness noun,
interchangeably adverb.