manual laborer vs workingman

manual laborer and workingman both are nouns.

Word	Noun	Adjective	Verb	Adverb
manual laborer	Yes	No	No	No
workingman	Yes	No	No	No

As nouns, workingman is a hypernym of manual laborer; that is, workingman is a word with a broader meaning than manual laborer:

manual laborer: someone who works with their hands; someone engaged in manual labor
workingman: an employee who performs manual or industrial labor

Other hypernyms of manual laborer include working man, working person, workman.

manual laborer (noun)	workingman (noun)
someone who works with their hands; someone engaged in manual labor	an employee who performs manual or industrial labor