Concertinas are small, portable musical instruments that have a distinct sound and are often used in folk music. There are several synonyms for the word "concertinas" that can be used to describe similar instruments. One common synonym is the accordion, which is another portable reed instrument that is often used in traditional music. Another synonym is the melodeon, which is a type of diatonic accordion that is popular in Irish music. Other synonyms for concertinas include the button accordion, the squeezebox, and the harmonium. No matter which term is used, these instruments are beloved for their unique sound and ability to transport listeners to a different time and place.