Convertible

Part of speech: adjective (a.)

1. Capable of being converted; susceptible of change; transmutable; transformable. Minerals are not convertible into another species, though of the same genus. Harvey.

2. Capable of being exchanged or interchanged; reciprocal; interchangeable. So long as we are in the regions of nature, miraculous and improbable, miraculous and incredible, may be allowed to remain convertible terms. Trench.