The term 'Bossa Nova Ancestor' refers to the Brazilian musical genre of SAMBA, which is a five-letter word. SAMBA originated in Brazil in the late 19th century and is a combination of African and European musical styles. It is characterized by its syncopated rhythms and is often accompanied by instruments such as the guitar, cavaquinho, and pandeiro. Bossa Nova is a style of SAMBA that emerged in the 1950s and is characterized by its slower tempo and more lyrical melodies.