handler vs animal trainer

handler and animal trainer both are nouns.

Word	Noun	Adjective	Verb	Adverb
handler	Yes	No	No	No
animal trainer	Yes	No	No	No

As nouns, handler and animal trainer are synonyms defined as:

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