labourer vs workingman

labourer and workingman both are nouns.

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

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

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

Other hypernyms of labourer include working man, working person, workman.

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