# Send Synonym Queries that Replace Query Text

You can use QMS to replace all the text in a query with the result of a synonym rule.

By default, QMS replaces terms that match the synonym rule `KEYWORDS` field with all terms that match the synonym rule `CONCEPT` field. Other terms in the query are not changed.

You can set the `SynonymReplace` action parameter in the query to replace all the query text with the `CONCEPT`.

For example, if you have set:

    #DREFIELD KEYWORDS="labrador"
    #DREFIELD CONCEPT="dog"

The following query:

    action=Query&Text=I walk my labrador in the park&ExpandQuery=True

expands to:

    action=Query&Text=I walk my dog in the park

However, the following query:

    action=Query&Text=I walk my labrador&ExpandQuery=True&SynonymReplace=True

expands to:

    action=Query&Text=dog

NOTE: If you set the `SYNONYMREPLACE` field in a synonym rule, the value of the field overrides the value of the action parameter when the query matches that rule.

For example, if your query has the `SynonymReplace` action parameter set to `True` and it matches a rule that has the `SYNONYMREPLACE` field set to `FALSE`, QMS ignores the action parameter and does not replace the query text.

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