Please Reply. Could you Suggest Any website or List of Words?

I need to write some essays using enriched words or phrasal verbs for a very important test next week. For example, the business increased very quickly. This can be written as The business skyrocketed. I love to use this kind of words. Please give me some websites or at least one which uses this kind of words. If you don't know any website name, then please give me a list of words.

The test is EXTREMELY important for me. So, please answer.