auk, bun, cut, dud, fun, gun, hut, IUD, jut, Kum, lug, mug, nut, out, put, Qum, rum, sum, tug, vug, wuz, yuk, Zug
Rue.
add
Aqi
obi
Some 3 letter words with the letter "r" in the middle are: are, bra, bro, arm, url, and ere.
amo
see see
pig
Bay
Mud, bud, dud...and lots more.
ers, urs
Fat.