Performable and Executable

performable

(a.) Admitting of being performed, done or executed; practicable.

Webster's Revised Unabridged Dictionary

executable

Capable of being done with means at hand and circumstances as they are.
- synonyms: feasible, practicable, viable, workable

(a.) Capable of being executed; feasible; as, an executable project.

Webster's Revised Unabridged Dictionary