Harness
Part of speech: noun
Definition: A restraint or support, especially one consisting of a loop or network of rope or straps. A collection of wires or cables bundled and routed according to their function.
Part of speech: verb
Definition: to place a harness on something; to tie up or restrain to capture, control or put to use
Example sentence: I read 'The Crystal Cave' book by Mary Stewart, and I thought it was a really, really interesting part of the legend, in which Merlin could enter into the cave with these crystals and see reflections of the future in them and learn how to use that and harness those powers for himself.
Rein
Part of speech: noun
Definition: A strap or rope attached to the bridle or bit, used to control a horse or other animal.
Part of speech: verb
Definition: to direct or stop a horse by using reins(usually "rein in") to stop or restrain a horse. Also used figuratively