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N at two and Y at three produces one word, and it is a term from river geography.
A snye is a side channel of a river that leaves the main stream and rejoins it further down. The word is used chiefly in Canada and the northern United States, and SNYES is its plural.
NY is common in English but it lives at the end of words, in ANY, MANY, TINY and FUNNY. Pushing it to the second and third boxes needs a consonant in front and two letters behind.
Almost nothing survives that. What is left is a single regional noun most speakers have never met in either form.
With one word on the page there is nothing to narrow. Confirming N at two and Y at three hands you the answer outright.
A channel that branches off a river and rejoins it, forming an island between the two. Canoeists and river surveyors use the term.
Only once you already know the pattern. You would never reach it by reasoning, so it is a word to recognise rather than chase.
It came into English from Canadian French, where chenail is the underlying word, and the spelling shifted over time.
Not in this list. The pair is far more productive in longer words and at the ends of shorter ones.