The words assure, ensure, and insure like to pretend that they are a lot more alike than they actually are. Though they look and smell the same, their meanings are fairly different.
- Assure means to guarantee or to say something with confidence.
- Ensure means you are going to make sure something does or does not happen, and don't you dare mess it up.
- Insure refers to the issuing of insurance, or coverage over losses. If you see any words relating to cars, houses, financial losses, car wrecks, etc. your best bet is insure.