"accessory" in the noun sense
1. accessory, accoutrement, accouterment
clothing that is worn or carried, but not part of your main clothing
2. accessory, appurtenance, supplement, add-on
a supplementary component that improves capability
3. accessory, accessary
someone who helps another person commit a crime
"accessory" in the adjective sense
1. accessary, accessory
aiding and abetting in a crime
"he was charged with being accessory to the crime"
2. accessory, adjunct, ancillary, adjuvant, appurtenant, auxiliary
furnishing added support
"an ancillary pump"
"an adjuvant discipline to forms of mysticism"
"The mind and emotions are auxiliary to each other"
Source: WordNet® (An amazing lexical database of English)
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