As nouns the difference between knackers and klackers
is that knackers is while klackers is a fad toy of the 1970s, consisting of two hard balls connected by a single string.
knackers
English
Noun
(head)
(pluralonly, British) Testicles.
Verb
(head)
(knacker)
klackers
English
Noun
(
wikipedia klackers)
(
head)
a fad toy of the 1970s, consisting of two hard balls connected by a single string.