Article 52. Principle of Homonymy
When two or more taxa are distinguished from each other they must not be denoted by the same name.
When two or more names are homonyms, only the senior, as determined by the Principle of Priority (see Article 52.3), may be used as a valid name; for exceptions see Articles 23.2 and 23.9 (unused senior homonyms) and Article 59 (secondary homonyms in the species group).
The relative precedence of homonyms (including primary and secondary homonyms in the case of species-group names) is determined by applying the relevant provisions of the Principles of Priority and the First Reviser [Arts. 23, 24].
The corrected spelling of an incorrect original spelling may enter homonymy but an incorrect original spelling cannot [Art. 32.4].