harness vs draw rein

harness is a noun but draw rein is not a noun.

Word	Noun	Adjective	Verb	Adverb
harness	Yes	No	Yes	No
draw rein	No	No	Yes	No

As verbs, harness and draw rein are synonyms defined as:

Other synonyms of harness include rein, rein in.

harness (noun)	draw rein (noun)
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
a support consisting of an arrangement of straps for holding something to the body (especially one supporting a person suspended from a parachute)

harness (verb)	draw rein (verb)
keep in check	control and direct with or as if by reins
exploit the power of
put a harness
control and direct with or as if by reins