An explanatory heuristic gives rise to the belief that words are well suited for their referents.

The mappings between the words of a language and their meanings are arbitrary. There is, for example, nothing inherently dog-like about the word dog. And yet, building on prior evidence (e.g., Brook, 1970; Piaget, 1967), the six studies reported here (N=1062) suggest that both children and (at least to some extent) adults see a special "fit" between objects and their names, as if names were particularly suitable or appropriate for the objects they denote. These studies also provide evidence for a novel proposal concerning the source of these nominal fit beliefs. Specifically, beliefs about nominal fit may be a byproduct of the heuristic processes that people use to make sense of the world more generally (Cimpian & Salomon, 2014a). In sum, the present studies provide new insights into how people conceive of language and demonstrate that these conceptions are rooted in the processes that underlie broader explanatory reasoning.