Communicate verb 

/kəˈmjuːnɪkeɪt/

100 years ago we communicated by mail. Now we can communicate by email.

Communicate with Dolphins use sound to communicate with each other.

They communicate well with one another

The disease is communicated through dirty drinking water.

a communicating door (= one that connects two rooms)

= a connecting door

Communication

 noun  /kəˌmjuːnɪˈkeɪʃn/

good communication between teachers and students 

She has a good communication skills.

communications technology

Community

/kəˈmjuːnəti/

He's well-known in the local community.

the Japanese community in China

the business/scientific community