【Work】 ,  【labor】 ,  【travail】 ,  【toil】 ,  【drudgery】 ,  【grind】  are comparable when they mean effort or exertion directed to the accomplishment of an end, or an employment or activity which involves such expenditure of effort or exertion.

【Work】 is the most comprehensive of these terms, for it may imply activity of body, mind, or machine or, in its largest sense, of a natural force. It is applicable not only to the exertion and to the employment which involves such exertion, but also to what is accomplished or produced by such exertion and to the material upon which one is employed.

【Labor】  differs from  【work】 not so much in its specific denotations as in its implications; as a rule it implies human 【work】 and therefore suggests physical or intellectual exertion only, but it may suggest 【work】 of strenuous, onerous, or fatiguing kind.

【Travail】  carries a stronger implication of painful effort or exertion than does  【labor】 ; that connotation is often so strong that the term tends to denote suffering rather than 【labor】 .

【Toil】 suggests 【labor】 that is prolonged and highly fatiguing but not necessarily physical.

【Drudgery】 implies dull, irksome, and distasteful 【labor】 .

【Grind】 applies to 【labor】 that one finds toilsome and trying or exhausting to mind or body.