As nouns the difference between nedder and edder
is that nedder is (uk|dialect|obsolete) an adder (kind of snake) while edder is flexible wood worked into the top of hedge stakes, to bind them together or edder can be an adder or snake.
As a verb edder is
(obsolete) to bind the top interweaving edder.
edder
English
Etymology 1
(etyl) ; akin to (etar).
Noun
(
en noun)
Flexible wood worked into the top of hedge stakes, to bind them together.
Verb
(
en verb)
(obsolete) To bind the top interweaving edder.
- to edder a hedge
Etymology 2
See adder.