Work is both a verb and a noun (uncountable); job is mostly used as a noun (countable): I’m busy – I have a lot of work. (uncountable noun) I have two jobs – I’m a taxi driver, but I also work as a part-time fireman. (countable noun) I’m a teacher at a nursery. It’s a great job – I love it. (countable noun) We say go to work, start work, finish work: I start work at 8 o’clock every morning. I go to work by bus.