fare vs train fare

fare and train fare both are nouns.

Word	Noun	Adjective	Verb	Adverb
fare	Yes	No	Yes	No
train fare	Yes	No	No	No

As nouns, train fare is a hyponym of fare; that is, train fare is a word with a more specific, narrower meaning than fare:

Other hyponyms of fare include airfare, bus fare, carfare, cab fare, taxi fare.

fare (noun)	train fare (noun)
an agenda of things to do	the fare charged for traveling by train
the food and drink that are regularly served or consumed
a paying (taxi) passenger
the sum charged for riding in a public conveyance

fare (verb)	train fare (verb)
eat well
proceed or get along