prevalence vs currency

prevalence and currency both are nouns.

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

As nouns, currency is a hyponym of prevalence; that is, currency is a word with a more specific, narrower meaning than prevalence:

prevalence (noun)	currency (noun)
the quality of prevailing generally; being widespread	the property of belonging to the present time
a superiority in numbers or amount	general acceptance or use
(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	the metal or paper medium of exchange that is presently used