General:
* Communication: This is the most common and general term.
* Exchange: This emphasizes the back-and-forth nature of communication.
* Interaction: This focuses on the active engagement between parties.
Specific:
* Message: This refers to the content being communicated.
* Dialogue: This refers to a conversation between two or more people.
* Correspondence: This refers to written communication, especially letters.
* Transmission: This refers to the act of sending information.
* Dissemination: This refers to spreading information widely.
* Conveying: This emphasizes the act of sharing information.
Figurative:
* Bridge: This symbolizes the connection between two people.
* Link: This emphasizes the connection established through communication.
The best noun to use will depend on the specific context. Think about what kind of communication you're describing and choose the word that best reflects its nature.