accessory

US /əkˈses.ər.i/
UK /əkˈses.ər.i/
"accessory" picture
1.

a thing which can be added to something else in order to make it more useful, versatile, or attractive

:
She bought a new phone accessory.
Fashion accessories can complete an outfit.
2.

a person who helps in the commission of a crime but is not present at the scene

:
He was charged as an accessory to the crime.
The police are looking for an accessory after the fact.
1.

contributing to or aiding in a crime

:
He was found accessory to the murder.