different between registrable vs registerable

English

registrable (not comparable)

Able or needing to be registered.
- 1994, Derek Roebuck, Law Relating to Banking in Hong Kong (page 212)
  Every mortgage of land evidenced in writing is registrable with the Land Office.
1. (law) In United States trademark law, capable of receiving trademark registration.

register +? -able

registerable (not comparable)

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