The Oxford Thesaurus An A-Z Dictionary of Synonyms - implement n.

1) utensil, tool, instrument, apparatus, device, appliance, contrivance, mechanism, (piece of) equipment, Colloq gadget, contraption: You need the proper implement for measuring inside diameters. --v. 2) carry out, execute, accomplish, perform, achieve, (put into) effect, bring about, cause, fulfil, realize: You will need our help to implement the plan.