quarterback vs football

quarterback and football both are nouns.

Word	Noun	Adjective	Verb	Adverb
quarterback	Yes	No	Yes	No
football	Yes	No	No	No

quarterback (noun)	football (noun)
(American football) the position of the football player in the backfield who directs the offensive play of his team	any of various games played with a ball (round or oval) in which two teams try to kick or carry or propel the ball into each other's goal
(football) the person who plays quarterback	the inflated oblong ball used in playing American football

quarterback (verb)	football (verb)
play the quarterback