As nouns the difference between knuckler and knuckles
is that knuckler is a knuckleball while knuckles is plural of lang=en.
As a verb knuckles is
third-person singular of knuckle.
As a proper noun Knuckles is
a nickname for a man employed for his fistfighting skill.
knuckler
English
Noun
(
en noun)
(baseball) A knuckleball
See also
*curveball
*slider
*fastball
*cut fastball
*two-seam fastball
*split finger fastball
*sinker
*screwball knuckles
English
Noun
(head)
Verb
(head)
(knuckle)