Yank
a shot that goes severely to the left of the target line (for a right-handed player) (also "pull, jerk")
Yardage
distance measured in yards (e.g., "yardage book, yardage marker")
Yardage book
a small booklet (given out or sold by a course, or created by the player or caddy) to keep various yardages, landmarks, references and notes about each hole on a particular golf course
Yardage marker
some type of landmark (usually permanent) indicating the yardage to the green -- most commonly measured to the center of the green but occasionally measured to the front of the green at a few rare courses
Yips
nervous twitching in the putting stroke resulting in poor accuracy and a lack of touch