eon; ear; eye; eel; eat; egg; elf; elk; elm; era; ego; end
cat, hat
add
Rue.
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
Fat.
A four letter word with RA in the middle: bran.
ers, urs