General Noun:
* Attention: This is the most common and general noun form. It refers to the act of focusing your mind on something.
* Attentiveness: This noun emphasizes the quality of being attentive.
More Specific Nouns:
* Attendee: This refers to someone who is present at an event or meeting.
* Audience: This refers to a group of people who are watching or listening to a performance or presentation.
The best noun to use will depend on the specific situation and what you want to emphasize.