different between nurser vs purser

English

nurse +? -er

nurser (plural nursers)

purse +? -er

purser (plural pursers)

The person responsible for handling the accounts on a ship, or for dealing with the passengers on a ship or aircraft.
- 1962, J. L. Austin, How To Do Things With Words
  If we offend against any of the other rules (A's or B's) - that is if we, say, utter the formula incorrectly, or if, say, we are not in a position to do the act because we are, say, married already, or it is the purser and not the captain who is conducting the ceremony, then the act in question, e.g. marrying, is not successfully performed at all, does not come off, is not achieved.

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