What is the collective noun for competitor?

There isn't a single, widely accepted collective noun for "competitor." However, here are some options you could use, depending on the context:

Formal:

* Field (e.g., "The field of competitors was strong this year.")

* Contenders (e.g., "The contenders for the championship were all highly skilled.")

* Participants (e.g., "The participants in the race were all eager to win.")

Informal:

* Rivals (e.g., "The rivals battled it out for first place.")

* Opponents (e.g., "The team faced tough opponents in the playoffs.")

* Contests (e.g., "There were a lot of contests for the best price.")

Descriptive:

* Group of competitors

* Gathering of competitors

* Array of competitors

* Squad of competitors

Ultimately, the best choice depends on the specific context and desired tone of your writing.