A contralto is a musical term used to describe a female singer with a low, rich, and resonant voice. There are various synonyms for the word contralto such as alto, mezzo-soprano, and low-pitched female voice. The term alto is a very common synonym for contralto and is often used by choristers when describing the female vocal range. Mezzo-soprano is also frequently used as a synonym for contralto as it describes a female voice that ranges from the lower notes of a soprano to the higher notes of an alto. Other synonyms for contralto include deep voice, dark voice, powerful voice, and low register. Overall, there are multiple synonyms for the word contralto, each describing the same type of female singing voice.