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328 five letter words begin with U, and nearly half of them are built on a single prefix.
N takes about forty six percent of the second box, which is the UN prefix rather than a spelling pattern.
R follows at twelve and P at eleven. After those three the numbers fall away to nothing.
UNDER, USING, USERS, UNTIL and UNION are the most common entries. Two of the five sit on that UN branch.
A prefix that productive means the branch is huge but shares only two letters. Confirming UN leaves three boxes still wide open.
So testing a smaller branch often narrows the field faster, even though it covers fewer words on paper.
USERS is the better opener than any UN word. It covers the S branch while testing E and R, and a miss still rules out a great deal.
UNTIL is the one to hold back, since it confirms the prefix without telling you much about what follows it.
It is the most common word here, but UN is shared by so many entries that confirming it narrows less than you would hope.
URBAN, URINE and URGED among others. It is the second largest branch and its words share far more than the UN group does.
U followed by another vowel is rare in English outside a handful of borrowed forms, so almost every entry here takes a consonant second.