Annexes is a term used to describe the act of adding or attaching something to an existing structure. The four letter word 'Adds' is a verb meaning to join or attach something to something else. The four letter word 'Eells' is a verb meaning to sell or offer for sale. The six letter word 'Addons' is a noun meaning something added to an existing structure. The six letter word 'Addson' is a noun meaning something that has been added to an existing structure.