Pan, pad, hat, mat, bat, bap, cap, bag, tap.
Rue.
add
obi
Aqi
Some 3 letter words with the letter "r" in the middle are: are, bra, bro, arm, url, and ere.
amo
see see
pig
Bay
Wit is a 3-letter word for the ability to say short and clever things.
Mud, bud, dud...and lots more.
ers, urs