convertible

a car that has top that can be folded or removed

a corporate security (usually bonds or preferred stock) that can be exchanged for another form of security (usually common stock)

a sofa that can be converted into a bed

capable of being exchanged for or replaced by something of equal value; "convertible securities"

designed to be changed from one use or form to another; "a convertible sofa"; "a convertible coupe"

capable of being changed in substance as if by alchemy; "is lead really transmutable into gold?"; "ideas translatable into reality"