Enable a Disabled Concept
Occasionally, maintenance on the Dictionary includes disabling outdated out-of-the-box (OOTB) dictionary concepts. Once the concepts are disabled, their associated synonyms are also unavailable.
If you need to use a disabled concept, you can use the following procedure to enable it again. Once you enable a concept, the synonyms associated with it are also available.
Note: You can see a list of disabled concepts in the Release Readiness document.