Book excerpt: While linguistic theory is in continual flux as progress is made in our ability to understand the structure and function of language, one constant has always been the central role of the word. On looking into words is a wide-ranging volume spanning current research into word-based morphology, morphosyntax, the phonology-morphology interface, and related areas of theoretical and empirical linguistics. The 26 papers that constitute this volume extend morphological and grammatical theory to signed as well as spoken language, to diachronic as well as synchronic evidence, and to birdsong as well as human language.