| baa | 
| bang | 
| bark | 
| beep | 
| belch | 
| boing | 
| boom | 
| brring | 
| bubble | 
| burp | 
| buzz | 
| cackle | 
| chirp | 
| chomp | 
| chortle | 
| chuckle | 
| clang | 
| clap | 
| clash | 
| clatter | 
| click | 
| clip clop | 
| clunk | 
| cock a doodle doo | 
| cough | 
| crackle | 
| creak | 
| croak | 
| crunch | 
| ding dong | 
| drip | 
| fizz | 
| fizzle | 
| flutter | 
| gasp | 
| glug | 
| groan | 
| growl | 
| grunt | 
| guffaw | 
| gurgle | 
| hiss | 
| honk | 
| hoot | 
| howl | 
| hum | 
| ker-ching | 
| knock knock | 
| miaow | 
| mmm | 
| moan | 
| mumble | 
| munch | 
| murmer | 
| mutter | 
| neigh | 
| oink | 
| parp | 
| ping | 
| pitter patter | 
| plink plonk | 
| plop | 
| pop | 
| purr | 
| quack | 
| ribbit | 
| rip | 
| roar | 
| rumble | 
| rustle | 
| screech | 
| shush | 
| slap | 
| slither | 
| smack | 
| smash | 
| snap | 
| snarl | 
| snore | 
| snort | 
| snuffle | 
| splash | 
| splat | 
| splatter | 
| splosh | 
| splutter | 
| squawk | 
| squeak | 
| squelch | 
| thud | 
| thwack | 
| tick tock | 
| trickle | 
| twang | 
| tweet | 
| waffle | 
| whimper | 
| whirr | 
| whizz | 
| whoosh | 
| woof | 
| yawn | 
| yelp | 
| zip | 
My suggestions:
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