confederate
noun /kənˈfedərət/
  /kənˈfedərət/
- a person who helps somebody, especially to do something illegal or secret synonym accomplice
- Rokovssky was his confederate in the assassination plot.
 
 - Confederatea person who supported the Confederate States in the American Civil War
 
Word Originlate Middle English: from late (ecclesiastical) Latin confoederatus, from con- ‘together’ + foederatus, based on foedus, foeder- ‘league, covenant’.