Swop
Part of speech: noun
Definition: An exchange of two comparable things.
Part of speech: verb
Definition: To exchange or give (something) in an exchange (for something else).
Barter
Part of speech: noun
Definition: an equal exchange
Part of speech: verb
Definition: exchange goods or services without involving money
Example sentence: Capitalism invariably boils down to barter between two willing parties, neither of whom uses force to work with the other.