c# - What's the difference of EventStream and EventBus -

i wondering if there difference between eventbus , eventstream or 2 synonyms? or eventstream layer above eventbus allows filter, transform, etc. events?

my quick differentiation 1 centralized , other topic/endpoint. i.e. if system used event bus (enterprise service bus?) each component subscribe centralized bus messages. if use eventstream, expect subscribe decentralized endpoint specific events subscribing to.