Toll-free
Part of speech: adjective
Definition: Free to use, not requiring paying a toll to use. Without an additional toll, especially for a long distance charge.
Fee
Part of speech: noun
Definition: A monetary payment charged for professional services.An estate of inheritance in land, either absolute and without limitation to any particular class of heirs (fee simple) or limited to a particular class of heirs (fee tail).An inheritable estate in land held of a feudal lord on condition of the performing of certain services.
Example sentence: Here's good advice for practice: go into partnership with nature; she does more than half the work and asks none of the fee.