dock worker vs manual laborer

dock worker and manual laborer both are nouns.

Word	Noun	Adjective	Verb	Adverb
dock worker	Yes	No	No	No
manual laborer	Yes	No	No	No

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

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

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

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