nudnick vs blighter

nudnick and blighter both are nouns.

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

As nouns, blighter is a hypernym of nudnick; that is, blighter is a word with a broader meaning than nudnick:

Other hypernyms of nudnick include bore, dullard, cuss, gadfly, pest, pesterer.

nudnick (noun)	blighter (noun)
(Yiddish) someone who is a boring pest	a persistently annoying person
	a boy or man