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26 five letter words start with OU, and more than a third of them take T as the third letter.
T takes about thirty five percent, then N and S at twelve each, P at eight and Z at eight.
OUTER, OUGHT, OUNCE and OUSTS are the entries a player would name, with OUTED and OUTDO behind them.
The rest of the page runs to obsolete forms and borrowed words, so six or seven entries is the realistic list.
OUTER is the guess to open with. It covers the dominant T shape and its E and R are the commonest endings in the group.
If the T misses, OUNCE is very nearly the only common alternative left.
It covers the T shape like OUTER does, but its G and H are weaker tests, so OUTER is the better of the two to lead with.
Only the last two boxes. Both share OUT, so a guess on either narrows the branch considerably.
OU is common inside English words but rare at the start, and the entries that do begin that way are mostly old or borrowed.