cover charge vs fixed charge

cover charge and fixed charge both are nouns.

Word	Noun	Adjective	Verb	Adverb
cover charge	Yes	No	No	No
fixed charge	Yes	No	No	No

As nouns, fixed charge is a hypernym of cover charge; that is, fixed charge is a word with a broader meaning than cover charge:

cover charge: a fixed charge by a restaurant or nightclub over and above the charge for food and drink
fixed charge: a periodic charge that does not vary with business volume (as insurance or rent or mortgage payments etc.)

Other hypernyms of cover charge include fixed cost, fixed costs.

cover charge (noun)	fixed charge (noun)
a fixed charge by a restaurant or nightclub over and above the charge for food and drink	a periodic charge that does not vary with business volume (as insurance or rent or mortgage payments etc.)