contingency fee vs fee

contingency fee and fee both are nouns.

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

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

contingency fee: a fee that is payable only if the outcome is successful (as for an attorney's services)
fee: a fixed charge for a privilege or for professional services

contingency fee (noun)	fee (noun)
a fee that is payable only if the outcome is successful (as for an attorney's services)	a fixed charge for a privilege or for professional services
	an interest in land capable of being inherited

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