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Only three words start with NG, and not one of them began in English.
NGAIO is a tree, NGOMA is a drum and NGWEE is a unit of currency. Each takes a different third letter, a different fourth and a different fifth, so any single confirmed box settles the page outright.
English does not begin words with NG. The sound exists in the language, as at the end of SING, but never at the front, which is why every entry here is a loanword.
That makes this page a dictionary check rather than a puzzle. If your game accepts them at all, one letter tells you which of the three it is.
One of the three repeats a letter, NGWEE with its doubled E. If a repeat is visible the page is over immediately.
Whether a given word game accepts any of these depends on the list it runs on. They are valid entries here, but they are the kind of word a narrower dictionary drops.
Yes, it is a small evergreen tree. Word game dictionaries carry it as a common noun.
The sound only occurs at the end or in the middle of English words. Languages that do allow it at the front are where all three of these came from.
A small currency unit. It is the only entry here that repeats a letter, doubling the E at the end.