chaser vs pursuer

chaser and pursuer both are nouns.

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

As nouns, chaser and pursuer are synonyms defined as:

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

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