Question: 'What is the difference between ... and ...?'
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'Job' is a noun. 'Work' is both a verb and a noun.
As nouns, the main difference is a grammatical one.
'Job' is a countable noun. This means that:
1. It has a plural form : jobs
2. In the singular form, it must be preceded by a determiner ( for example, a, my , that)
'Work' is an uncountable noun. This means that:
1. It has no plural form.
2. It cannot be preceded by an indefinite article (a)
The word 'job' refers to a specific task or employment. 'Work' can be a more general term. For example 'He has a job' means that he is employed, whereas 'He has some work' might mean casual or temporary work.
In British English, the adjective 'smart' means well-dressed. You can take advice from a US English speaker about the American use of 'smart' in the sense of clever.