Common words:
* Special
* Official
* Social
* Financial
* Commercial
* Provincial
* Judicial
* Beneficial
* Artificial
* Essential
Less common words:
* Congenial
* Differential
* Ephemeral
* Experimental
* Fictional
* Initial
* Material
* Musical
* Presidential
* Traditional
* Victual
Words formed by adding "-cial" to other words:
* Agricultural
* Educational
* Industrial
* Medical
* Political
* Residential
This is not an exhaustive list, but it gives you a good starting point for words ending in "-cial."