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334 five letter words start with O, and the second box is more scattered here than on any other vowel.
R leads at about sixteen percent and nothing else reaches nine. U, L, C, S and N all sit between five and eight.
With a spread that thin, no single guess into the second box buys you much, so pick words for what their other four boxes rule out.
OTHER, ORDER, OFFER, OFTEN and OWNER are the most common entries, and three of the five sit on that leading R branch.
OFFER, OCCUR and ODDLY all double their second letter, and the shape turns up more readily after O than after most openings.
If the second and third boxes come back matching, this is where to look first.
OTHER is the natural opener. It is the most common entry and its T, H, E and R cover four separate high frequency letters.
O begins far fewer English roots than A does, and it does not carry the prefix families that inflate other openings.
OTHER. ORDER repeats its R, which wastes a box, while OTHER tests five distinct letters.
OUNCE, OUTER and OUGHT among others. It is the second largest branch but it holds fewer everyday words than its size suggests.