Enter criteria and click Find Words
Only three words put I first and N third. At that size there is nothing to strategise about, so this page is really just the list.
Words like INDEX and INEPT put the N in the second box, not the third. This pattern needs a letter between them, and English almost never does that.
INNER is the one you would actually use, and IONIC is the other most people recognise. INNED turns up in word game lists more often than in writing.
Two of the three double the N, so a visible repeat leaves INNER and INNED with the last box deciding. If there is no repeat, IONIC is the answer.
There is no branch to narrow here and no distribution to read. Check which of the three fits the boxes you already have.
No. INDEX has N in the second box, not the third. It sits on the I first and D third pattern instead.
It is a past tense of the verb to in, meaning to gather or house something. Word game dictionaries accept it but you will not meet it in ordinary writing.
It runs I, O, N, I, C. The O sits between the I and the N, which is exactly what this pattern asks for and exactly what makes it rare.