fixed charge vs fixed costs

fixed charge and fixed costs both are nouns.

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

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

fixed charge and fixed costs: 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 cost.

fixed charge (noun)	fixed costs (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.)