(n.) One who, or that which, grubs; especially, a machine or tool of the nature of a grub ax, grub hook, etc.

administer to attend attend on be busy beast of burden care for chore dance attendance upon dig do for do service to domestic domestic servant donkeywork dray horse drudgery fag galley slave greasy grind grind grub grubber hack hammer hammer away help hireling keep doggedly at labor lackey look after maid menial mercenary minister to moil muck pander to peg peg away peon plod plodder plow plug plug along plug at plug away plugging pound pound away scullion servant serve servitor slave slavery slavey slog slog away slogger swot take care of tend toil toiler travail turnspit upon valet wade through wait wait on work work away work for workhorse