仕事 (しごと) means "work" or "labor." tacking this onto the end of almost anything will qualify that as "work pertaining to" that thing. Examples include 手仕事 (てしごと), which means "manual (hand) labor" (you'll notice the roots are the exact same as the English), 水仕事 (みずしごと), "kitchen work," and 野良仕事 (のらしごと), "farm work." to use it as a verb (to work), you simply tack the all-purpose する at the end, making 仕事する (しごとする), literally "do work." You can also use 仕事 to refer to a task or an assignment, but not a job. Usually, words like バイト are used for that.