cover charge vs fixed costs

cover charge and fixed costs both are nouns.

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

As nouns, fixed costs is a hypernym of cover charge; that is, fixed costs 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 costs: 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 charge, fixed cost.

cover charge (noun)	fixed costs (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.)