A person, thing, or medicine that alleviates, relieves, or reduces pain, suffering, or difficulty.
From alleviate plus agent suffix -or (one who or that which). The -or ending marks this as the standard form for nouns describing an agent of action.
An alleviator doesn't heal—it just makes the wait more bearable, which is why aspirin is one of humanity's most important discoveries even though it doesn't cure anything.
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