Ⅰ.job “工作”，既可指固定的工作，也可指临时的或某项具体的工作，是可数名词，前面可用不定冠词a, 也可以有复数形式。如：
① John lost his job. John失业了。
② There were just not enough jobs.没有那么多的工作(可干)。
③ Tom’s father is looking for a job.
Ⅱ,work 是个普通用词，泛指一切工作，是不可数名词。如：
① I have a lot of work to this evening. 教师的工作就是教学。
② A teacher’s work is teaching.老师的工作就是教学。
[联想]：搭配
apply/hung for a job.求职 get/ find a job.找到一份工作
lose one’s job。失业 perform odd job.打零工
quit a job. 辞职 have/work a side job 兼职
take a part-time/full-time job in a department store.
在百货公司担任兼职或专职工作。