Countertenor is a term used to describe a male singer who uses his falsetto voice range to sing. However, there are several synonyms that can be used in place of this term. Some of these include alto, mezzo-soprano, sopranist, male soprano, and contra tenor. These synonyms are used to describe a male singer who can sing at a higher range than the typical male voice. The use of these terms is common in classical music, particularly in opera, where men are sometimes required to sing a high-pitched song. While they may have different implications, they all refer to the same thing: a male with a higher-than-average singing range.