Functionally and Operable

adverb

• With respect to function.
  • usage: "the two units are functionally interdependent"

(adv.) In a functional manner; as regards normal or appropriate activity.

adjective

• Capable of being treated by surgical operation.
  • usage: "an operable cancer"
• Fit or ready for use or service.
  • usage: "the toaster was still functional even after being dropped"; "the lawnmower is a bit rusty but still usable"; "an operational aircraft"; "the dishwasher is now in working order"
  • synonyms: functional, usable, useable, operational
• Usable for a specific purpose.
  • usage: "an operable plan"; "a practicable solution"
  • synonyms: practicable

(a.) Practicable.