differential cost vs marginal cost

differential cost and marginal cost both are nouns.

Word	Noun	Adjective	Verb	Adverb
differential cost	Yes	No	No	No
marginal cost	Yes	No	No	No

As nouns, differential cost and marginal cost are synonyms defined as:

differential cost and marginal cost: the increase or decrease in costs as a result of one more or one less unit of output

Other synonyms of differential cost include incremental cost.

differential cost (noun)	marginal cost (noun)
the increase or decrease in costs as a result of one more or one less unit of output	the increase or decrease in costs as a result of one more or one less unit of output