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Only three words start with IT, and two of them are in ordinary use.
C, E and H each take the third box once. With three words in total that single letter separates the whole page, so one confirmed box is all you need.
ITEMS and ITCHY are the two most people carry. ITHER is a dialect form of either and it is the one that will not come to mind.
There is no distribution to read at this size and no branch to narrow. Compare the three against whatever letters your puzzle has confirmed and play the one that fits.
Nothing here repeats a letter, so a visible double rules the pattern out entirely. Each word also ends differently, with Y, S and R taking one apiece.
Usually. ITCHY is the realistic alternative and the two share nothing after the opening pair.
ITSELF runs to six letters, so it cannot fit a five letter puzzle. That is a large part of why this page is so short.
A dialect form of either. Word game dictionaries carry it but you would not meet it in ordinary writing.