field general vs signal caller

field general and signal caller both are nouns.

Word	Noun	Adjective	Verb	Adverb
field general	Yes	No	No	No
signal caller	Yes	No	No	No

As nouns, field general and signal caller are synonyms defined as:

field general and signal caller: (American football) the position of the football player in the backfield who directs the offensive play of his team

Other synonyms of field general include quarterback.

As nouns, field general and signal caller are synonyms defined as:

field general and signal caller: (football) the person who plays quarterback

Other synonyms of field general include quarterback.

field general (noun)	signal caller (noun)
(American football) the position of the football player in the backfield who directs the offensive play of his team	(American football) the position of the football player in the backfield who directs the offensive play of his team
(football) the person who plays quarterback	(football) the person who plays quarterback