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Ninth
In music, a ninth is a compound interval consisting of an octave plus a second.
Like the second, the interval of a ninth is classified as a dissonance in common practice tonality. Since a ninth is an octave larger than a second, its sonority level is considered less dense.
Wikipedia
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Nineth (adjective)
alternative spelling of ninth
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Ninth (adjective)
The ordinal form of the number nine.
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Ninth (noun)
The person or thing in the ninth position.
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Ninth (noun)
One of nine equal parts of a whole.
Wiktionary