different between utterer vs butterer

English

utter +? -er

utterer (plural utterers)

One who utters something.
- 1961, Harvard Law Review (volume 74, page 457)
  Some maintain that arbitration avoids prejudiced juries and sympathy verdicts, but such remarks may merely reflect their utterers' antijury bias.

butter +? -er

butterer (plural butterers)

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