1. A computer-implemented method comprising: receiving a first collection of terms that are designated as cohyponyms, and that are in a first natural language; generating a second collection of terms by translating the terms of the first collection that are designated as cohyponyms from the first natural language to a second natural language; receiving a candidate pair of terms in the second natural language; determining, by one or more computers, that both candidate terms of the received pair are present in the second collection of terms; and determining to not revise a query that includes a first candidate term of the pair, to include a second candidate term of the pair, based at least on determining that both candidate terms of the pair are present in the second collection of terms.