convertible

(noun) a car that has top that can be folded or removed.

(noun) a corporate security (usually bonds or preferred stock) that can be exchanged for another form of security (usually common stock). Synonyms: convertible security.

(noun) a sofa that can be converted into a bed. Synonyms: sofa bed.

(adj) capable of being exchanged for or replaced by something of equal value. Synonyms: convertible (vs. inconvertible), exchangeable. Example: "Convertible securities."

(adj) designed to be changed from one use or form to another. Examples: "A convertible sofa." "A convertible coupe."

(adj) capable of being changed in substance as if by alchemy. Synonyms: transformable, translatable, transmutable. Examples: "Is lead really transmutable into gold?." "Ideas translatable into reality."