Doable and Executable

doable

Capable of existing or taking place or proving true; possible to do.
- synonyms: accomplishable, achievable, manageable, realizable

(a.) Capable of being done.

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