labourer vs manual laborer

labourer and manual laborer both are nouns.

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

As nouns, labourer and manual laborer are synonyms defined as:

labourer and manual laborer: someone who works with their hands; someone engaged in manual labor

Other synonyms of labourer include jack, laborer.

labourer (noun)	manual laborer (noun)
someone who works with their hands; someone engaged in manual labor	someone who works with their hands; someone engaged in manual labor