slave vs galley slave

slave and galley slave both are nouns.

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

As nouns, galley slave is a hyponym of slave; that is, galley slave is a word with a more specific, narrower meaning than slave:

Other hyponyms of slave include bondman, bondsman, bondmaid, bondswoman, bondwoman, bond servant, creature, puppet, tool.

slave (noun)	galley slave (noun)
a person who is owned by someone	a slave condemned to row in a galley
someone who works as hard as a slave	a laborer who is obliged to do menial work
someone entirely dominated by some influence or person

slave (verb)	galley slave (verb)
work very hard, like a slave