What is the analogy in choir is to chorus?

The analogy of choir to chorus can be understood in terms of structure and function. A choir typically refers to a group of singers who perform together, often with a focus on vocal harmony and Classical Music, while a chorus is a broader term that can encompass various types of vocal ensembles, including those in musical theater or popular music. Both terms refer to collective singing, but they may differ in style and context. Thus, a choir is a specific type of chorus, highlighting the relationship of a subset within a larger category.