septet

n (piece of music written for a) group of seven instruments or singers 七重奏（曲）; 七重唱（曲）.

Seoul, sepal, separability, separable, separably, separate, separate from, separate...from, separated, separately, separateness, separation, separatism, separatist, separator, sepia, sepsis, Sept, sept(i)-, September, septic, septic tank, septicaemia (US septicemia), septuagenarian, sepulchral, sepulchre (US sepulcher), sequel, sequela, sequence, sequence of tenses, sequential, sequentially, sequester, sequestered, sequestrate, sequestration, sequin, sequoia, seraglio, seraph,