Noun

work, labor, travail, toil, drudgery, grind mean activity involving effort or exertion. work may imply activity of body, of mind, of a machine, or of a natural force.
// too tired to do any work labor applies to physical or intellectual work involving great and often strenuous exertion.
// farmers demanding fair compensation for their labor travail is bookish for labor involving pain or suffering.
// years of travail were lost when the house burned toil implies prolonged and fatiguing labor.
// his lot would be years of back-breaking toil drudgery suggests dull and irksome labor.
// an editorial job with a good deal of drudgery grind implies labor exhausting to mind or body.
// the grind of the assembly line

Noun

labor and work mean action involving effort or exertion. work can apply to either mental or physical effort and may involve something that is enjoyable but tiring.
// Decorating the gym was hard work. labor suggests great or unpleasant usually physical exertion.
// She dreaded the dull labor of cleaning.