harassment vs annoyance

harassment and annoyance both are nouns.

Word	Noun	Adjective	Verb	Adverb
harassment	Yes	No	No	No
annoyance	Yes	No	No	No

As nouns, annoyance is a hypernym of harassment; that is, annoyance is a word with a broader meaning than harassment:

Other hypernyms of harassment include chafe, vexation.

harassment (noun)	annoyance (noun)
the act of tormenting by continued persistent attacks and criticism	the act of troubling or annoying someone
a feeling of intense annoyance caused by being tormented	something or someone that causes trouble; a source of unhappiness
	anger produced by some annoying irritation
	an unpleasant person who is annoying or exasperating
	the psychological state of being irritated or annoyed