The difference between Convertible and Drophead

When used as nouns, convertible means interchangeable things or terms, whereas drophead means a drophead coupé.

Convertible is also adjective with the meaning: able to be exchanged, one for the other, especially.

check bellow for the other definitions of Convertible and Drophead

Convertible as an adjective (historical, _, currency):

Able to be converted, particularly: Able to be exchanged, one for the other, especially # Able to be exchanged for specie. # Able to be exchanged for foreign currency. # Able to be exchanged for a different class of security (usually common stock) under certain set terms. Able to undergo conversion (i.e., inversion) without falsehood. Able to be turned, especially # Able to be turned in a different direction. #* 1635, Nathanael Carpenter, Geography Delineated Forth in Two Bookes (1.4.77) #*: The Axis of the Earth is supposed to haue a convertible nature. # Able to be turned to a different purpose. # Able to be turned to a different religion or belief. Able to be turned into a different thing, especially # Able to change from a closed to an open frame and back again. # Able to be easily digested.

Convertible as a noun (dated, in plural):

Interchangeable things or terms.
Convertible as a noun (vehicles):

A convertible car: a car with a removable or foldable roof able to convert from a closed to open vehicle and back again.
Convertible as a noun (finance):

A convertible security: a stock, bond, etc. that can be turned into another (usually common stock) under certain set terms.
Convertible as a noun (computing):

A computer able to convert from laptop to tablet and back again.