accessory

[1]	extra , accoutrement , accouterment , addition , adjunct , attachment , component , frill , (Slang) bells and whistles , doodah , (US/Canadian) doodad
[2]	accessary , appurtenance , supplement , accomplice , helper , add-on , assistant , confederate , colleague , abettor , aide , collaborator , co-conspirator , conspirator , fellow-criminal , associate/partner in crime
[3]	accessary

adj.

[1]	extra , subordinate , auxiliary , additional , ancillary , supplemental , supplementary , secondary , adventitious , (Formal) adscititious
[2]	accessary
[3]	adjunct , ancillary , adjuvant , appurtenant , auxiliary