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Fare= price to travel.

Bus fare, Taxi fare, Train fare.

Re: ???


Fare-as Amigo said.
Tip-a little bit extra just for the person providing a service. You might give a tip to a waiter at a restaurant, which is a small payment just to that person, on top of paying the bill to the establishment.
Tariff-normally some sort of tax. Very common charge placed on imports in some countries, usually to protect their own industries producing the same goods.
Toll-A payment required to use some roads. Known as a toll road. It's used to recover the cost of building the road and/or for maintenance (that's the theory anyway).