handler vs tamer

handler and tamer both are nouns.

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

As nouns, tamer is a hyponym of handler; that is, tamer is a word with a more specific, narrower meaning than handler:

handler (noun)	tamer (noun)
(sports) someone in charge of training an athlete or a team	an animal trainer who tames wild animals
one who trains or exhibits animals
an agent who handles something or someone