harasser vs harrier

harasser and harrier both are nouns.

Word	Noun	Adjective	Verb	Adverb
harasser	Yes	No	No	No
harrier	Yes	No	No	No

As nouns, harasser and harrier are synonyms defined as:

harasser (noun)	harrier (noun)
a persistent attacker	hawks that hunt over meadows and marshes and prey on small terrestrial animals
a persistent tormentor	a hound that resembles a foxhound but is smaller; used to hunt rabbits
	a persistent attacker