reading many books about this for awhile; try to sum up what i think.
work, all jobs done can call “work”, related or not is not subjective. what done is done
career, when you think in term of growth; you looking forward when you head of. your “career” may or may not lookalike others and in the same time the relation and development of your career is up to you, not the company you work with.
calling, hardest one to define and most promising. calling is it end in itself, everything in your life is mean to this end. when you knew your “calling” you can define your own career and can filter all work that not related to that quite easy.