accessory

Adjective

• furnishing added support
  • an ancillary pump
    
  • an adjuvant discipline to forms of mysticism
    
  • The mind and emotions are auxiliary to each other
    

• aiding and abetting in a crime
  • he was charged with being accessory to the crime
    

Noun

• someone who helps another person commit a crime

• a supplementary component that improves capability

• clothing that is worn or carried, but not part of your main clothing

Related words

• Synonyms: 
  adjunct , ancillary , adjuvant , appurtenant , auxiliary , accessary , appurtenance , supplement , add-on , accoutrement , accouterment