convertible - noun

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

convertible - adjective

• capable of being exchanged for or replaced by something of equal value
• designed to be changed from one use or form to another
• capable of being changed in substance as if by alchemy

convertible - thesaurus

exchangeable   transformable   translatable   transmutable