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Eighteen words carry R second and G third, and two of the commonest are built from the same letters.
Rearrange one and you get the other. An organ is a body part or an instrument, argon is an inert gas, and the shared spelling is pure accident.
For a solver that is awkward. Knowing every letter in the answer still leaves the order unresolved, and nothing about this pattern helps you settle it.
ORGAN, ARGUE, URGED and URGES are the entries in ordinary use. ARGUS and ARGOT turn up in reading rather than speech.
A takes nine of the eighteen, O takes four, U takes three and E takes two. An R in second place needs a vowel ahead of it, and that rules out every consonant.
An argot is the private vocabulary of a group, while ergot is a fungus that infects rye. One letter apart and utterly unrelated.
ERGON, a term from philosophy meaning function or purpose, sits beside ERGOT and makes the E branch harder still.
Only the opening letter and the fourth differ in position. Test O or A at the front directly, since no later letter will distinguish them.
Potter's clay, from the Greek for white earth. ARGOL, a crust deposited by wine in casks, sits nearby and is equally specialist.
A row of stakes or spikes used in old fortifications. It comes from the French for organ, after the resemblance to organ pipes.