workman vs working person

workman and working person both are nouns.

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

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

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

Other synonyms of workman include working man, workingman.

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