accessory, accessary -- (someone who helps another person commit a crime)
Overview of adj accessory
The adj accessory has 2 senses
accessary, accessory -- (aiding and abetting in a crime; "he was charged with being accessory to the crime")
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")