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Ten words put I first and T third, and the IN opening takes half of them. The rest are scattered one or two at a time.
N takes the second box in five of the ten. INTER, INTRA and INTRO are the reachable ones, and INTEL and INTIL fill out the branch.
All five of them run INT before anything else happens, so landing in the branch tells you three letters at once and then leaves the last two wide open. INTER and INTRO differ only at the end.
IOTAS is the most useful word here outside the branch. ICTUS and ICTIC come from the C branch of two words, and ISTLE and IXTLE are variant spellings of the same plant fibre.
Endings spread thin, with S, L and E each closing two words and nothing taking more.
Nothing on the page repeats a letter either. Between those two facts there is very little to narrow on after the second box, so spend your first guess there.
They are variant spellings of the same fibre and both appear on this list. A puzzle could accept either, so confirm the second letter before committing.
On this list it is a five letter entry meaning intelligence in the military sense. It sits in the IN branch alongside INTER and INTRA.
It is the only genuinely everyday word outside the IN branch. If the second letter is not N, IOTAS is the first thing to try.