skos:prefLabel, skos:altLabel and skos:hiddenLabel are pairwise disjoint properties.The range of skos:altLabel is the class of RDF plain literals.
skos:definition
An alternative lexical label for a resource.
skos:example
Acronyms, abbreviations, spelling variants, and irregular plural/singular forms may be included among the alternative labels for a concept. Mis-spelled terms are normally included as hidden labels (see skos:hiddenLabel).