In my opinion : teaching
When taken as :
Hobby: A lot of to enjoy for yourself but Students who are there to not only to learn also to pass the exam may got disturbed because they love an old face of teacher with lot of experiments and experiences. Also they are proud to here , this year my question will be selected for final examination, Which I am sure to not fulfill by the one who teaches for hobby.
Occupation: A repeated job which you perform today tomorrow and the day after tomorrow , only you got happiness on the day of salary distribution.
Job:You try a lot to get success because jobs are to be performed but no special goal are achieved by you.
Profession: It hard to explain, When you got sink on this profession you just lost in it you have no other matters to think and also a bad effect you do not find yourself fit for other job, its simply a ............................,