labourer vs working man

labourer and working man both are nouns.

Word	Noun	Adjective	Verb	Adverb
labourer	Yes	No	No	No
working man	Yes	No	No	No

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

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

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

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