harness has 5 distinct synonyms spread across 3 of its 6 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is unharness.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
exploit the power of
“harness natural forces and resources”
a support consisting of an arrangement of straps for holding something to the body (especially one supporting a person suspended from a parachute)
stable gear consisting of an arrangement of leather straps fitted to a draft animal so that it can be attached to and pull a cart
Synonyms, antonyms and the broader and narrower relations for harness come from Princeton University’s WordNet. Full sources and licences.