working person vs workingman

working person and workingman both are nouns.

Word	Noun	Adjective	Verb	Adverb
working person	Yes	No	No	No
workingman	Yes	No	No	No

As nouns, working person and workingman are synonyms defined as:

working person and workingman: an employee who performs manual or industrial labor

Other synonyms of working person include working man, workman.

working person (noun)	workingman (noun)
an employee who performs manual or industrial labor	an employee who performs manual or industrial labor