Constructive and Usable

adjective

• Constructing or tending to construct or improve or promote development.
  • usage: "constructive criticism"; "a constructive attitude"; "a constructive philosophy"; "constructive permission"
• Emphasizing what is laudable or hopeful or to the good.
  • usage: "constructive criticism"

• (a.) Having ability to construct or form; employed in construction; as, to exhibit constructive power.
• (a.) Derived from or depending on, construction or interpretation; not directly expressed, but inferred.

adjective

• Capable of being put to use.
  • usage: "usable byproducts"
  • synonyms: useable
• 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, useable, operable, operational
• Convenient for use or disposal.
  • usage: "the house is available after July 1"; "2000 square feet of usable office space"
  • synonyms: available, useable