workload vs case load

workload and case load both are nouns.

Word	Noun	Adjective	Verb	Adverb
workload	Yes	No	No	No
case load	Yes	No	No	No

As nouns, case load is a hyponym of workload; that is, case load is a word with a more specific, narrower meaning than workload:

workload: work that a person is expected to do in a specified time
case load: the number of cases handled in a given period of time (as by a court or agency)

workload (noun)	case load (noun)
work that a person is expected to do in a specified time	the number of cases handled in a given period of time (as by a court or agency)