19. The one or more non-transitory computer-readable media as recited in claim 17 , the operations further comprising: sending the language model difference information to the computing device.
17. One or more non-transitory computer-readable media maintaining instructions executable by one or more processors to perform operations comprising: determining an n-gram comprising a sequence of one or more words based at least in part on parsing a plurality of digital works, wherein the plurality of digital works are associated with a particular subject matter category; associating a first probability of occurrence with the n-gram based at least in part on a frequency of occurrence of the n-gram in the plurality of digital works; and determining language model difference information based at least in part on the first probability of occurrence associated with the n-gram differs from a second probability of occurrence of the n-gram in a base language model by more than a threshold amount; and determining a word based at least in part on a captured utterance, the base language model and the language model difference information.