15 possible answers to
Answers with 3 characters: AGE EON ERA Answers with 4 characters: AEON AGES EONS Answers with 5 characters: AEONS EPOCH YEARS Answers with 7 characters: DOGSAGE CENTURY Answers with 8 characters: BLUEMOON COONSAGE Answers with 9 characters: MILLENIUM Answers with 15 characters: AMONTHOFSUNDAYS