18. The system of claim 16 , where the one or more types of words include verbs.
16. The system of claim 14 , where the one or more processors are further to: adjust the probability for each of the one or more links based on one or more types of words that occur in web pages and do not occur in queries, where, when storing the particular information, the one or more processors are further to store: the information identifying the probability for each of the one or more links after adjusting the probability for each of the one or more links, and the information indicating that the concept is related to the particular web page.