labourer vs workman

labourer and workman both are nouns.

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

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

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

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

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