15. One or more computer-readable hardware storage media comprising instructions stored thereon that, responsive to execution by a computing device, causes the computing device to perform operations comprising: generating, at least partially in hardware of the computing device, a vocabulary for use in natural language processing for a particular one of a plurality of domains by: building an N-gram tree to represent frequency of occurrence of words in search results involving the particular domain, the search results obtained using a spreading activation algorithm constrained to the particular domain; selecting a set of the words based on the represented frequency of occurrence in the N-gram tree; and assigning a sense to each of the words in the set that identifies a part-of-speech of a respective said word, the sense reflecting, for each of the words, how each of the words are used in the particular domain of the plurality of domains.
15. One or more computer-readable hardware storage media comprising instructions stored thereon that, responsive to execution by a computing device, causes the computing device to perform operations comprising: generating, at least partially in hardware of the computing device, a vocabulary for use in natural language processing for a particular one of a plurality of domains by: building an N-gram tree to represent frequency of occurrence of words in search results involving the particular domain, the search results obtained using a spreading activation algorithm constrained to the particular domain; selecting a set of the words based on the represented frequency of occurrence in the N-gram tree; and assigning a sense to each of the words in the set that identifies a part-of-speech of a respective said word, the sense reflecting, for each of the words, how each of the words are used in the particular domain of the plurality of domains. 18. One or more computer-readable hardware storage media as described in claim 15 , wherein the part-of-speech is a noun, verb, adjective, or adverb.