hard worker

English Thesaurus

1. someone who works as hard as a slave (noun.person)

hypernym	:	worker,
definition	:	a person who works at a specific occupation (noun.person)

derivation	:	break one's back, buckle down, knuckle down, slave,
definition	:	work very hard, like a slave (verb.social)

derivation	:	break one's back, buckle down, knuckle down, slave,
definition	:	work very hard, like a slave (verb.social)