Cognitive science ; Wissensdarstellung; Knowledge representation; Representation (mental) ; Natural kind terms; Mental representation ; Basic level concept; Concept (psycholing.) ; Sprache und Denken; Erkenntnis und Sprache; Language and thought; Erkenntnistheorie; Epistemology and language; Language and epistemology ; Semantik (Theorie) ; Semantic theory; Theory (semant.)