Sound imitation or onomotopoeic words are echoes of natural sounds (lullaby, twang, whiz).

Sound imitation (onomotopoeia or echoism) is the naming of an action or thing by a more or less reproduction of a sound associated with it.

For instance, words naming sounds and movement of water:

babble     журчать 

blob          брызгать 

bubble       булькать 

flush            литься 

gurgle          булькать 

gush             литься потоком 

splash          расплескаться

The majority of onomotopoeic words serve to name sounds or movements. Most of them are verbs easily turned into nouns: bang, boom, bump, hum, rustle, smack, thud, etc.

Sound - imitating words form a considerable part of interjections: bang! hush! pooh!

To be continued.