Concerto
Famous cello concertos include those by Antonín Dvořák, Edouard Lalo, Edward Elgar and Dmitri Shostakovich.  Tchaikovsky wrote a piece for cello and orchestra called Rococo Variations and Benjamin Britten wrote a piece for cello and orchestra which he called a “Cello Symphony” because the cello and orchestra are equal in importance.  Brahms wrote a Double Concerto for violin and cello with orchestra.