Here's why:
* Common Noun: A common noun refers to a general category of people, places, or things (e.g., dog, city, chair). While "body part" could be considered a common noun, it's not the most accurate description.
* Collective Noun: A collective noun refers to a group of individuals or things considered as a single unit (e.g., team, flock, family). "Body parts" refers to a collection of individual body parts that make up a whole body.
Example:
* "The doctor examined the patient's body parts." (Here, "body parts" refers to a group of individual parts.)
Therefore, "body parts" is a collective noun because it represents a group of individual items.