dock worker vs labourer

dock worker and labourer both are nouns.

Word	Noun	Adjective	Verb	Adverb
dock worker	Yes	No	No	No
labourer	Yes	No	No	No

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

dock worker: a laborer who loads and unloads vessels in a port
labourer: someone who works with their hands; someone engaged in manual labor

Other hypernyms of dock worker include jack, laborer, manual laborer.

dock worker (noun)	labourer (noun)
a laborer who loads and unloads vessels in a port	someone who works with their hands; someone engaged in manual labor