Some jobs have more than one description, so you can tweak your job title as long as you are still telling the truth. Yes, your job can legitimately be described in a number of ways to get yourself a better deal.
For instance if you update your job description from ‘Artist’ to ‘Illustrator’ you could see a difference in price. And while insurers have a lot of jobs on their list they won’t always have the perfect one, so try to be as accurate as possible to see what fits.
But tweaking the wording is not the same as out and out lying. Saying you’re a nurse when you are in reality a rugby player could make your policy invalid.