The Oxford Thesaurus An A-Z Dictionary of Synonyms - slave n.

1) lackey or lacquey, scullion, serf, slave-girl, slaveling, odalisque or odalisk, bondservant, bondslave, bondsman or bondman, bondswoman or bondwoman, bondmaid, vassal, Derogatory chiefly Brit skivvy, Archaic esne, helot, hierodule, Colloq Brit slavey: In ancient times, captured peoples and those of lower social status were kept as slaves. 2) drudge, workhorse, hack, grind, toiler, labourer, Chiefly Brit fag, dogsbody, Colloq US gofer: Susan was a slave to her job for years, only to be sacked without a pension by the new owners. --v. 3) labour, toil, moil, grind, grub, drudge, sweat, burn the midnight oil, lucubrate, work one's fingers to the bone, work like a Trojan or a horse, Brit skivvy: He was slaving over an essay that was due the following morning.