This link contains terminology that are not formally placed in the IEEE dictionaries, and communication words that will be helpful to the protection engineer in his workplace.
Below is a document containing a list of words that PSRC Working Groups have generated and the Terminology Review Working Group (I2) has processed.
Link to PDF of Terminology Document
The IEEE Standards Dictionary offers a comprehensive database of standards terminology across all of IEEE. It is available to the public or via IEEE Xplore.