fixed charge vs fixed cost

fixed charge and fixed cost both are nouns.

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

As nouns, fixed charge and fixed cost are synonyms defined as:

fixed charge and fixed cost: a periodic charge that does not vary with business volume (as insurance or rent or mortgage payments etc.)

Other synonyms of fixed charge include fixed costs.

fixed charge (noun)	fixed cost (noun)
a periodic charge that does not vary with business volume (as insurance or rent or mortgage payments etc.)	a periodic charge that does not vary with business volume (as insurance or rent or mortgage payments etc.)