As a proper noun guyana

is a country in south america official name: co-operative republic of guyana.

As an acronym concacaf is

(soccer) c'onfederation]] '''o'''f '''n'''orth, '''c'''entral '''a'''merican and '''c'''aribbean [[association football|'''a'''ssociation ' f ootball — the governing body for the sport in the aforementioned region, also including the south american countries of french guiana, guyana, and suriname.