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UK. Though maybe Cambridge is slow/conservative in noticing usage change. https://dictionary.cambridge.org/dictionary/english/corn https://dictionary.cambridge

• OJFord 5y ago
  'Corn' alone is unusual I'd say, and someone saying it yes probably in agriculture and means any grain. Otherwise 'sweetcorn' or 'corn on the cob' ('corncob') are common. But you can't have e.g. 'wheat on the cob' so it's not ambiguous.