The term 'TEXT OF AN OPERA' can be summarized as the LIBRETTO, which is an 8-letter word. A LIBRETTO is the text of an opera, which is a musical drama typically composed of vocal pieces with orchestral accompaniment and usually with orchestral overtures and interludes. It is typically written in verse or prose and includes the plot, characters, and dialogue. The LIBRETTO is the basis for the musical score and is often written by a poet, playwright, or librettist.