The phrase "able to be changed" has multiple synonyms, depending on the context and intended meaning. It can be expressed as "modifiable," "alterable," "mutable," "transformable," or "adjustable." "Modifiable" refers to something capable of being changed or adjusted under certain conditions. "Alterable" suggests adjustability in a more profound sense, such as the ability to fundamentally change the structure of something. "Mutable" is similar to "modifiable" but emphasizes the capacity to be prone to change. "Transformable" generally implies a significant change in form, nature or appearance. Finally, "adjustable" suggests the ability to make minor or incremental changes to something.