accessory
n
1 abettor, accomplice, assistant, associate (in crime) colleague, confederate, helper, partner
2 accent, accompaniment, addition, add-on, adjunct, adornment, aid, appendage, attachment, component, convenience, decoration, extension, extra, frill, help, supplement, trim, trimming
adj
3 abetting, additional, aiding, ancillary, assisting in, auxiliary, contributory, extra, secondary, subordinate, supplemental, supplementary