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73 five letter words begin with NI, and a large share of what fills the list are names rather than vocabulary.
N and T lead at about twelve percent each, then C and D at eight and G and X at seven.
NIGHT, NINJA, NINTH, NICHE and NITRO are the entries most people would name, with NIFTY, NICER and NIECE behind them.
The rest of the page runs heavily to first names and place names, so the usable count is a fraction of 73.
NINJA, NINTH and NINES all run NIN and split only across the last two boxes, which makes that branch quick to finish once you are inside it.
NIGHT is the guess to start with. It is much the most common word here and its G, H and T rule out a great deal when they miss.
It takes IE rather than EI, which is the pattern most players guess wrongly. Worth checking before you commit a turn to it.
A small set of place names. It is seven percent of the count but holds nothing a puzzle would realistically use.
It is usually said with a SH ending rather than a hard CH, which is why players sometimes rule the spelling out from sound alone.