My first is in sound, but not in thunder. What am I?

My first is in sound, but not in thunder.
My second is in noise, but not in poise.
My third is in outrage, but not in grater.
My fourth is in whimper, but not in whisper.
My fifth is in squash, but not in squelches.
My sixth is in mutter, but not in murmur.
My seventh is in gosh, but not in gasp.
My eighth is in yelp, but not in yell.
My ninth is in hoarse, but not in harsh.
My tenth is in eerie, but not in fairy.
My eleventh is in bliss, but not in bless.
My last is in splat, but not spilt.
What am I?

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Onomatopoeia

This is a word whose sound suggests the sense (eg buzz and hiss).