Do you enjoy your job?
Can I use "work" instead of "job" in that sentence? Are they synonyms? How about this sentence:
"Do you want to go for a drink after work?"
To me its basically a distinction between:
work - the physical activity itself, or the time spent working.
job - the actual position, functions, duties that describe the work you do. Generally used in a broader sense than work.
I work from 8 to 5.
I will be working at the branch office this week.
and for your examples:
Do you enjoy your work? (This is OK, referring to the actual work functions you perform.)
Do you want to go for a drink after work? (work refers to the time you were working that day.)
As for job:
Do you enjoy your job? (This is OK, but more a question about your overall opinion about your position, what you do, how well you work with other, your boss, etc.)
Did you apply for that job yet?
It was a difficult job but someone had to do it.
I did not understand the job requirements.