component,
constituent,
element an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system; "spare components for cars"; "a component or constituent element of a system"
computer accessory an accessory for a computer; "when you add in all the computer accessories you are going to need the computer gets pretty expensive"
fitting putting clothes on to see whether they fit
appurtenance -
equipment consisting of miscellaneous articles needed for a particular operation or sport etc.
appurtenance -
The thing to which another pertains.
appurtenance -
Minor property such as an outhouse that passes with the main property when it is sold.
appurtenance -
A modifier that is appended or prepended to another word to coin a new word that expresses belonging.
Wikipedia
Appurtenances is a term for what belongs to and goes with something else, with the appurtenance being less significant than what it belongs to. The word ultimately derives from Latin appertinere, "to appertain". In a legal context, an appurtenance could for instance refer to a back-yard that goes with the adjoining house.
