9-letter word – GLADIATOR
Some other words of five letters or more containing the hub letter R:
agora, altar, aorta, argal, argot, aroid, artal, atria, goral, grail, griot, groat,
laird (Scot), largo, radio, raita, ratio, riata, taira, tiara, trail, triad, trial,
adroit, aortal, argali, atrial, lariat, latria, radial, tailor.
