While "entireness" is a noun, it's not a direct equivalent to "entire". It means the state or quality of being complete or whole.
Here are some examples of how "entireness" is used:
* "The entireness of the experience was breathtaking."
* "He was committed to the entireness of the project."
To use a noun for "entire", you would typically use "the whole" or "the entirety".
Here are some examples:
* "The whole team worked together on the project."
* "He donated the entirety of his savings."