1. A method comprising: receiving, by a processor in a computer system, information indicating that a pair of queries is associated with a threshold quantity of search results that are common between the pair of queries, a first query, in the pair of queries, including an extra term that is not included in a second query in the pair of queries; identifying, by a processor in the computer system and based on receiving the information indicating that the pair of queries is associated with the threshold quantity of search results that are common between the pair of queries, the extra term as not significant; receiving, by a processor in the computer system, information indicating that another pair of queries is not associated with the threshold quantity of search results that are common between the other pair of queries, a first query, in the other pair of queries, including the extra term and a second query, in the other pair of queries, not including the extra term; identifying, by a processor in the computer system, a context in which the extra term is significant, the context in which the extra term is significant being based on the information indicating that the pair of queries is associated with the threshold quantity of search results that are common between the pair of queries; and storing, by a processor in the computer system, information including the extra term, an indication that the extra term is not significant, and the context in which the extra term is significant.