
Appurtenance
Accessory Nature
Understand that 'appurtenance' often refers to items that enhance the main object but are not essential.

A detachable camera lens is an appurtenance to the photographer's equipment.
Not Standalone
'Appurtenance' implies dependency; it doesn't make sense without the main item it's associated with.

A pool is an enjoyable appurtenance to a house, not a structure on its own.
Enhanced Value
Appurtenances are meant to increase the value or functionality of the item they accompany.

The smartphone case with a built-in battery is a valuable appurtenance.
Compare with
AccessoryAccompanyAdditionAdjunctAnnexAppendageAttachmentSupplement
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