Animal Sounds:
* Meow (cat)
* Woof (dog)
* Moo (cow)
* Oink (pig)
* Cluck (chicken)
* Roar (lion)
* Chirp (bird)
Nature Sounds:
* Crackle (fire)
* Sizzle (frying)
* Rustle (leaves)
* Splash (water)
* Drip (water)
* Thunder (storm)
* Whirr (wind)
Human Sounds:
* Cough
* Sneeze
* Sigh
* Yawn
* Scream
* Whisper
* Shush
Object Sounds:
* Bang (door)
* Click (mouse)
* Buzz (bee)
* Honk (car horn)
* Tick-tock (clock)
* Zip (zipper)
Action Sounds:
* Plop (dropping something)
* Thump (falling)
* Screech (brakes)
* Wham (hitting something)
* Zoom (fast movement)
Words that are actually onomatopoeia:
* Boom
* Pop
* Snap
* Swish
* Clang
* Biff
* Pow
Note: Onomatopoeia can be subjective and vary across languages and cultures.