currency vs prevalence

currency and prevalence both are nouns.

Word	Noun	Adjective	Verb	Adverb
currency	Yes	No	No	No
prevalence	Yes	No	No	No

As nouns, prevalence is a hypernym of currency; that is, prevalence is a word with a broader meaning than currency:

currency (noun)	prevalence (noun)
the property of belonging to the present time	the quality of prevailing generally; being widespread
general acceptance or use	a superiority in numbers or amount
the metal or paper medium of exchange that is presently used	(epidemiology) the ratio (for a given time period) of the number of occurrences of a disease or event to the number of units at risk in the population