One who erects or builds something; a person or tool that raises something into an upright position.
From 'erect' (Latin 'erigere') plus the agent noun suffix '-er,' which creates nouns meaning 'one who does X.' Common pattern in English for occupational or action-related nouns.
In construction, 'erectors' have specific certifications—it's a real job title for the people who assemble skyscrapers, proving that even humble '-er' words can describe specialized expertise.
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