customer's man vs customer's broker

customer's man and customer's broker both are nouns.

Word	Noun	Adjective	Verb	Adverb
customer's man	Yes	No	No	No
customer's broker	Yes	No	No	No

As nouns, customer's man and customer's broker are synonyms defined as:

customer's man and customer's broker: someone in charge of a client's account for an advertising agency or brokerage or other service business

Other synonyms of customer's man include account executive, account representative, registered representative.

customer's man (noun)	customer's broker (noun)
someone in charge of a client's account for an advertising agency or brokerage or other service business	someone in charge of a client's account for an advertising agency or brokerage or other service business