Reins

Definition:

(n. pl.) The kidneys; also, the region of the kidneys; the loins.
(n. pl.) The inward impulses; the affections and passions; -- so called because formerly supposed to have their seat in the part of the body where the kidneys are.

Compare reins with other words:

reins vs. ruins

abutment vs. reins

reins vs. spring

crown vs. reins

reins vs. vault

kidney vs. reins

bridle vs. reins

reins vs. shank