handler vs John Joseph McGraw

handler and John Joseph McGraw both are nouns.

Word	Noun	Adjective	Verb	Adverb
handler	Yes	No	No	No
John Joseph McGraw	Yes	No	No	No

handler (noun)	John Joseph McGraw (noun)
(sports) someone in charge of training an athlete or a team	United States baseball player and manager (1873-1934)
one who trains or exhibits animals
an agent who handles something or someone