pursuer vs chaser

pursuer and chaser both are nouns.

Word	Noun	Adjective	Verb	Adverb
pursuer	Yes	No	No	No
chaser	Yes	No	No	No

As nouns, pursuer and chaser are synonyms defined as:

pursuer and chaser: a person who is pursuing and trying to overtake or capture

pursuer (noun)	chaser (noun)
a person who is pursuing and trying to overtake or capture	a drink to follow immediately after another drink
a person who pursues some plan or goal	a person who is pursuing and trying to overtake or capture