skos:exactMatch is disjoint with each of the properties skos:broadMatch and skos:relatedMatch.

skos:exactMatch is used to link two concepts, indicating a high degree of confidence that the concepts can be used interchangeably across a wide range of information retrieval applications. skos:exactMatch is a transitive property, and is a sub-property of skos:closeMatch.

http://www.w3.org/2004/02/skos/core

has exact match