handler vs manager

handler and manager both are nouns.

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

As nouns, handler and manager are synonyms defined as:

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

Other synonyms of handler include coach.

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