Suppletion is a term used to describe the occurrence of unpredictable and irregular patterns. Although typological research has been devoted to verb suppletion, not as much attention has been given to suppletion in nominal and adjectival paradigms. The thesis presents the cross-linguistic distribution of nominal and adjectival suppletion. The lexical distribution as well as the features involved are presented. The results of nominal suppletion show that nouns referring to humans are most often suppletive, that number is the most common grammatical feature involved in nominal suppletion and that „child‟ is by far the most common noun to be suppletive cross-linguistically. The results on adjectival suppletion show that adjectival suppletion i...