Addition and Attachment

Addition noun - A smaller structure added to a main building.

Attachment is a synonym for addition in annex topic. In some cases you can use "Attachment" instead a noun "Addition", when it comes to topics like adjunct, accessory, inclusion, adding.

Nearby Words: additional, adding, additive, additionally

Attachment noun - A supplementary part or accessory.

Addition is a synonym for attachment in accessory topic. You can use "Addition" instead a noun "Attachment", if it concerns topics such as annex, adjunct, something joined.

Nearby Words: attach, attached, attaching, attachable, attache