Difference between Outpouring and Onslaught

Outpouring

Part of speech: noun

Definition: The sudden flowing of a large amount of something.

Example sentence: When I went public with my breast cancer diagnosis six weeks ago, the overwhelming outpouring of love, prayers and support really helped me heal faster. I want to make sure to thank everyone.

Onslaught

Part of speech: noun

Definition: A fierce attack.A large quantity of people or things resembling an attack.