Urania

6 clues
Muse
A Muse
Erato's sister
Sister of Erato
Sister of Thalia
Sister of Calliope
Similar answers:
Abjuration
Abyssinia
Abyssinian
Abyssinianpeople
Abyssinianshare
Abyssinianshepherd
Acculturate
Accuracy
Accurate
Accurately
Accuraterate
Aceventura
Acrania
Actinia
Actnatural
Actressvirginia
Actyourage
Acura
Acuracsx
Acuralegend