pesterer vs blighter

pesterer and blighter both are nouns.

Word	Noun	Adjective	Verb	Adverb
pesterer	Yes	No	No	No
blighter	Yes	No	No	No

As nouns, pesterer and blighter are synonyms defined as:

Other synonyms of pesterer include cuss, gadfly, pest.

pesterer (noun)	blighter (noun)
a persistently annoying person	a persistently annoying person
	a boy or man