General synonyms:
* Contain
* Embrace
* Encompass
* Incorporate
* Comprise
* Consist of
* Feature
* Involve
* Cover
* Mention
* List
More specific synonyms:
* Add (for adding something to a list or group)
* Integrate (for incorporating something into a system)
* Assimilate (for making something part of a larger whole)
* Supplement (for adding something to enhance or complete something else)
The best synonym will depend on the specific context of your sentence.