chat room
{'<entity_0>': 'any form of synchronous conferencing', '<entity_1>': 'chat room', '<entity_2>': 'chatroom'}
[['chat room', 'alternative', 'chatroom'], ['chat room', 'description', 'any form of synchronous conferencing']]
The term <entity_1>, or <entity_2>, is primarily used to describe <entity_0>, occasionally even asynchronous conferencing.
['online chat']