Orbiting Solar Observatory
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noun
OSO.
QUIZ
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Test how much you really know about regular and irregular plural nouns with this quiz.
Question 1 of 9
Which of the following nouns has an irregular plural form?
Words nearby Orbiting Solar Observatory
orbital velocity, orbiteer, orbiter, Orbiting Astronomical Observatory, Orbiting Geophysical Observatory, Orbiting Solar Observatory, orbitography, orbitonasal, orbitonometer, orbitotomy, Orbivirus
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