General Knowledge:
* Familiar: implies a personal acquaintance with something.
* Recognized: implies widespread awareness.
* Acknowledged: implies formal recognition.
* Established: implies a long-standing reputation or fact.
* Noted: implies prominence or fame.
* Famous: implies widespread renown.
* Celebrated: implies high regard.
* Renowned: implies exceptional reputation.
* Noted: implies being distinguished.
* Noted: implies being distinguished.
* Prominent: implies being important or influential.
Personal Knowledge:
* Aware: implies being conscious of something.
* Informed: implies having knowledge about something.
* Apprised: implies being told about something.
* Cognizant: implies being aware of something.
* Conscious: implies being aware of something.
Specific Knowledge:
* Identified: implies being able to distinguish something.
* Determined: implies having discovered something.
* Ascertained: implies having found out something.
* Verified: implies having confirmed the accuracy of something.
* Discovered: implies having found something previously unknown.
Informal:
* Heard of: implies casual awareness.
* In the know: implies being informed about something.
* Up to speed: implies being informed about something.
Other options:
* Public: implies that something is widely known.
* Common: implies that something is widely known and understood.
* Certain: implies that something is known for sure.
* Definite: implies that something is known for sure.
* Unquestionable: implies that something is undeniably known.
To choose the best word, consider the context and the specific meaning you want to convey.