handler vs John McGraw

handler and John McGraw both are nouns.

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

handler (noun)	John 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