1. A method comprising: mining one or more search results for a domain to determine a frequency at which words occur in the one or more search results, respectively; selecting a set of the words based on the determined frequency; assigning a sense to each of the selected set of the words that identifies a part-of-speech for a respective said word; and generating a vocabulary that includes the selected set of the words and a respective said sense, the vocabulary configured for use in natural language processing associated with the domain.