Accompanier is a term used to refer to a person or object that accompanies another. It is often used in musical contexts to refer to the person or instrument that provides backing to the main melody. Synonyms for the word Accompanier include, but are not limited to, collaborator, partner, companion, supporter, assistant, follower, and escort. In addition, the term can also be substituted with words like backup, harmonizer, co-pilot, chaperone, aid, or helper. These words are often used in various settings to refer to the person that works in harmony with the lead player, singer, or speaker to achieve a successful outcome.