1."neither...nor"
used in pair as opposit to "either...or".It can be followed by a noum or clause.
E.g.,
Neither cat nor dog likes swimming.
2.not vs.never
They're interchangable,but "never" is much stronger.
Compare the following examples:
Do not say "no.
Never say "never"!
3.nor vs no
"no" can be used like an adjitive before noun,but not "nor".
E.g,
No cat likes dog!