draw rein vs rein

draw rein is not a noun while rein is a noun.

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

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

Other synonyms of draw rein include harness, rein in.

draw rein (noun)	rein (noun)
	one of a pair of long straps (usually connected to the bit or the headpiece) used to control a horse
	any means of control

draw rein (verb)	rein (verb)
control and direct with or as if by reins	keep in check
	stop or slow up one's horse or oneself by or as if by pulling the reins
	stop or check by or as if by a pull at the reins
	control and direct with or as if by reins