A person or tool that sorts things into groups or categories; something that performs the act of categorization.
From categorize (American spelling) plus -er (one who does, or a thing that does). The agent noun form indicating who or what performs categorization.
Modern AI systems are sophisticated categorizers that can sort millions of items instantly, but unlike humans, they don't inherently understand why their categories matter or what they mean.
Complete word intelligence in one call. Free tier — 50 lookups/day.