navvy vs labourer

navvy and labourer both are nouns.

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

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

navvy: a laborer who is obliged to do menial work
labourer: someone who works with their hands; someone engaged in manual labor

Other hypernyms of navvy include jack, laborer, manual laborer.

navvy (noun)	labourer (noun)
a laborer who is obliged to do menial work	someone who works with their hands; someone engaged in manual labor