Nouns

(n)harnessa support consisting of an arrangement of straps for holding something to the body (especially one supporting a person suspended from a parachute)
(n)harnessstable gear consisting of an arrangement of leather straps fitted to a draft animal so that it can be attached to and pull a cart

Verbs

(v)harness, tackleput a harness“harness the horse”
(v)harnessexploit the power of“harness natural forces and resources”
(v)harness, rein in, draw rein, reincontrol and direct with or as if by reins“rein a horse”
(v)rule, harness, reinkeep in check“rule one's temper”