To Mitigate is to make mild the burden.
To remove is to take it away altogether.
1. Something must be done to mitigate his sufferings.
2. He needs help to mitigate his problems.
1. How can you remove your enemy from your path ?
2. Will someone remove all this rubbish.
3. He removed all the evidence of the crime.
4. I can't remove this stain from my shirt.
5. He has been removed from the post of minister of education.