alleviater
/ˌæl.vi.ˈeɪ.ɪ.tər, -ˌiˈeɪ.ˌtɛr/Definitions
1. noun
one that alleviates; a person or thing that makes a difficult or unpleasant situation less severe
“The new policy was designed to alleviate the financial burdens on low-income families, but it was initially met with resistance from the alleviaters of the old system.”
2. verb
to make (something) less severe or difficult
“The doctor’s visit was able to alleviate her concerns about the diagnosis.”