• botornis mantelli,
• motornis mantelli,
• jotornis mantelli,
• hotornis mantelli,
• nitornis mantelli,
• nktornis mantelli,
• nltornis mantelli,
• nptornis mantelli,
• n0tornis mantelli,
• n9tornis mantelli,
• norornis mantelli,
• nofornis mantelli,
• nogornis mantelli,
• noyornis mantelli,
• no6ornis mantelli,
• no5ornis mantelli,
• notirnis mantelli,
• notkrnis mantelli,
• notlrnis mantelli,
• notprnis mantelli

The adjective form of the term "Notornis Mantelli" would be "Notornis Mantelli". The species name "Mantelli" is already an adjective that describes the type of bird belonging to the Notornis genus. Therefore, it already functions as the adjective form when used in a taxonomic context.

The plural form of "Notornis Mantelli" is "Notornis Mantellii".

The singular form of the word "Notornis Mantelli" is "Notornis Mantelli". This is because "Notornis Mantelli" is the scientific name for a specific species of bird, commonly known as the Takahe. Scientific names for species do not typically have a plural or singular form as they are used to identify a specific organism.