Can you determine what is unique about the words below besides having at least two repeated letters?

ACIDIC
IGNITING
MOTTO
PREFER
ROCOCO

Answer:

Moving the first letter to the end of each word and reading the result backward yields the same word. There are only about 30 common words of five or more letters in the entire English language that have this property.

Credit: GAMES/World of Puzzles
April, 2016
Raymond Love
COMING OR GOING

Note from JA: To see eight more words with this property see IN COMMON post of 6/21/10.