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Only six words carry R second and D third, and one of them does all the work.
It is the only entry in everyday use, and it is common enough to be the answer nearly every time this pattern comes up. ARDOR, the American spelling of ardour, is the next most recognisable.
ARDEB is an Egyptian unit of dry measure and ARDRI was a high king of Ireland. ORDOS is the plural of ordo, a calendar of church services, and URDEE is a heraldic term for a cross with pointed ends.
Different fields, and not one of them a word anybody would guess. It is a typical shape for a group this small, where one common word carries the page and the rest are specialist survivals.
A takes three of the six, O takes two and U takes one. A consonant in front of the R simply does not work at this length.
E fills the fourth box in three of the six and R closes two, which is what gives ORDER and ARDOR their shared shape.
Not guaranteed, but close to it. Nothing else here is a word a setter could expect a solver to produce.
A unit of dry measure used in Egypt and nearby countries. It is a trade term with no modern currency.
The high king of Ireland, from the Irish ard ri meaning high king. It is a historical title.
One does, and it is URDEE with its double E at the end.