Blather is a alternative form of blether.

As nouns the difference between blether and blather

is that blether is {{cx|especially|northern England|Scotland|Northern Ireland|lang=en}} an alternative spelling of lang=en while blather is nonsensical or foolish talk.

As verbs the difference between blether and blather

is that blether is {{cx|especially|northern England|Scotland|Northern Ireland|lang=en}} an alternative spelling of lang=en while blather is to talk rapidly without making much sense.