fee

nouns

a fixed charge for a privilege or for professional services
fee
is a type of (narrower)
a periodic charge that does not vary with business volume (as insurance or rent or mortgage payments etc.)
fixed charge, fixed cost, fixed costs
an interest in land capable of being inherited
fee
is a type of (narrower)
(law) a right or legal share of something; a financial involvement with something
"they have interests all over the world"; "a stake in the company's future"
interest, stake

verbs

give a tip or gratuity to in return for a service, beyond the compensation agreed on
"Remember to tip the waiter"; "fee the steward"
bung, fee, tip