customer's man vs account executive

customer's man and account executive both are nouns.

Word	Noun	Adjective	Verb	Adverb
customer's man	Yes	No	No	No
account executive	Yes	No	No	No

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

customer's man and account executive: 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 representative, customer's broker, registered representative.

customer's man (noun)	account executive (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