galley slave vs laborer

galley slave and laborer both are nouns.

Word	Noun	Adjective	Verb	Adverb
galley slave	Yes	No	No	No
laborer	Yes	No	No	No

As nouns, laborer is a hypernym of galley slave; that is, laborer is a word with a broader meaning than galley slave:

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

Other hypernyms of galley slave include jack, labourer, manual laborer.

galley slave (noun)	laborer (noun)
a slave condemned to row in a galley	someone who works with their hands; someone engaged in manual labor
a laborer who is obliged to do menial work