workingman vs workman

workingman and workman both are nouns.

Word	Noun	Adjective	Verb	Adverb
workingman	Yes	No	No	No
workman	Yes	No	No	No

As nouns, workingman and workman are synonyms defined as:

workingman and workman: an employee who performs manual or industrial labor

Other synonyms of workingman include working man, working person.

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