docking fee vs fee

docking fee and fee both are nouns.

Word	Noun	Adjective	Verb	Adverb
docking fee	Yes	No	No	No
fee	Yes	No	Yes	No

As nouns, fee is a hypernym of docking fee; that is, fee is a word with a broader meaning than docking fee:

docking fee (noun)	fee (noun)
a fee charged for a vessel to use a dock	a fixed charge for a privilege or for professional services
	an interest in land capable of being inherited

docking fee (verb)	fee (verb)
	give a tip or gratuity to in return for a service, beyond the compensation agreed on