This is the Full Orchestra Catagory of Dan Forrest’s Jubilate Deo choral work.
Orchestra is a broad term for any musical group, also referred to as an ensemble, which has a strong presence of string instruments.
A symphony orchestra can include more than 100 musicians, who are split into various sections which pertain to the types of instruments that they play. These instrument categories include strings, woodwinds, brass, and percussion. This larger group of musicians play “symphonies”— large, grand pieces that often require a deep variety of at least 18 to 25 different instruments.
At the heart of the idea is that if an orchestra is big enough to play a symphony, it’s a symphony orchestra.