nudnik vs pesterer

nudnik and pesterer both are nouns.

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

As nouns, pesterer is a hypernym of nudnik; that is, pesterer is a word with a broader meaning than nudnik:

Other hypernyms of nudnik include bore, dullard, blighter, cuss, gadfly, pest.

nudnik (noun)	pesterer (noun)
(Yiddish) someone who is a boring pest	a persistently annoying person