General "greatness":
* Nui: This is a very common word meaning "big," "large," or "great" in terms of size or importance.
* Ngahau: This word means "joy," "pleasure," or "delight," and can be used to describe something that is great in a positive, enjoyable way.
Specific "greatness":
* Nui atu: This means "greater" or "more great," and is used to compare two things.
* Whanui: This word means "wide," "broad," or "extensive," and can be used to describe something that is great in scope or influence.
* Mana nui: This phrase translates to "great power" or "high prestige," and is used to describe someone or something that is powerful and respected.
For specific situations, you might consider:
* Teitei: This means "tall," "high," or "lofty," and can be used to describe something that is great in stature or achievement.
* Whanaunga: This means "closely related" or "belonging to the same family," and can be used to describe something that is great in a sense of shared connection.
The best word to use will depend on the specific context and what you want to emphasize.