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52 five letter words begin with OR, and a fifth of them take A as the third letter.
A leads at about twenty one percent, then G, I and L at ten each, T at eight and B at six.
ORDER, ORGAN, ORBIT and ORCAS are the entries in ordinary use, with ORIEL and ORALS behind them.
The rest of the page runs to place names and technical forms, so the usable list is a good deal shorter than the count.
Six entries out of fifty two is the realistic figure, which puts this page closer to the small two letter openings than its count suggests.
It is far more common than anything else here and it repeats its R across the second and fourth boxes, a shape no other everyday entry uses.
ORDER first, simply because nothing else on this page comes close to it in frequency. If it misses, ORGAN and ORBIT cover the next two branches.
ORBIT. Its B and I reach ground ORGAN does not, and the T ending is commoner here than N.
It is the plural of orca and it appears in general writing about whales, so it is a reasonable if uncommon answer.
ORA opens several unrelated roots at once, from oral to orange forms, which is enough to double it against the next branch.