manager vs handler

manager and handler both are nouns.

Word	Noun	Adjective	Verb	Adverb
manager	Yes	No	No	No
handler	Yes	No	No	No

As nouns, manager and handler are synonyms defined as:

manager and handler: (sports) someone in charge of training an athlete or a team

Other synonyms of manager include coach.

manager (noun)	handler (noun)
someone who controls resources and expenditures	(sports) someone in charge of training an athlete or a team
(sports) someone in charge of training an athlete or a team	one who trains or exhibits animals
	an agent who handles something or someone