Difference between Knuckleball and Knuckler

KNUCKLEBALL vs KNUCKLER: NOUN

An event that is hard to predict.
A pitch thrown with the ball gripped on the fingertips and released with no rotation which travels over an unpredictable path to the plate due to micro-turbulence in the air.
A baseball pitch thrown with little speed or spin

Right hander, Backspin, Ball, Fireballer, Lefty, Bullpen, Footwork, Screwball, Slider, Changeup, Sinker, Forkball, Fastball, Curveball, Knuckler

Right hander, Backspin, Ball, Fireballer, Lefty, Bullpen, Footwork, Screwball, Slider, Changeup, Sinker, Forkball, Fastball, Curveball, Knuckler

I had really no feel for the breaking ball, couldnt throw my fastball for strikes, and my knuckleball also wasnt doing very well.
Charlie Gillmer is a lifelong Twins fan who spends most nights dreaming of learning a knuckleball and pitching them to a World Series victory.
How does a baseball pitcher throw a knuckleball, a pitch with no movement, to a helpless batter?
The knuckleball is gripped using the thumb, index finger and middle finger.
Dickey knuckleball and froze Ryan Raburn to end a Nationals threat.
The same is true, incidentally, on a knuckleball.