13. The computer-readable storage medium of claim 9 , wherein determining that both candidate terms of the pair are present in the second collection of terms comprises determining that the candidate pair matches a pair of terms included in the second collection of terms.
13. The computer-readable storage medium of claim 9 , wherein determining that both candidate terms of the pair are present in the second collection of terms comprises determining that the candidate pair matches a pair of terms included in the second collection of terms. 14. The computer-readable storage medium of claim 13 , wherein determining to not revise a query that includes a first candidate term of the pair, to include a second candidate term of the pair comprises: altering a confidence value associated with the candidate pair of terms to indicate a lower level of confidence that the terms of the pair are synonyms, and determining to not revise the query to include the second candidate term of the pair based on the altered confidence value.