A person who abhors something; someone who feels or expresses intense hatred or disgust toward something.
From abhor plus -er agent suffix, creating a noun for the person performing the action. The -er suffix is one of English's most productive ways to create agent nouns from verbs.
The word 'abhorrer' is grammatically simple but philosophically interesting—it defines a person primarily by what they hate rather than what they love, showing how we often identify people through their moral judgments and revulsions.
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