[kmm]

In most English dialects, pizza is /ˈpitsə/, with unvoiced /t/ and /s/. Would you say it's not in yours?

Things like this is why using example words to clarify pronunciation is often a bad idea, especially with a language as diverse as English.

[nonsapreiche]

In italian the zz in pizza is voiced loud, in razzo is unvoiced like in the example you made. And of course I assume that pizza is na italian world, and all english dialects that pronounce different from the original are wrong

[naniwaduni]

It's pretty hard to pin this down firmly since attested pronunciations range wider than you seem to think, but based on what you've said in this thread, it seems like a good idea to sanity-check on the voiced/unvoiced distinction.

In the following clips, [1] has voice, [2] has unvoiced: [1]: https://audio00.forvo.com/audios/mp3/3/k/3k_9459069_74_57198... [2]: https://audio00.forvo.com/audios/mp3/s/x/sx_9001968_74_57198...

[darkwater]

I think "razzo" pronunciation varies depending on the zone/speaker. It is often pronounced the same as "pizza", although it /shouldn't/.

[jaclaz]

Well, we have also razza and razza (as in race/breed and spoke/ray/stingray) and they are respectively /ˈrat.t͡sa/ and /ˈrad.d͡za/ where the difference in pronounciation is key to the meaning.

Pizza is definitely /ˈpit.t͡sa/ (and both the t and the s are voiced).

Razzo (rocket) is /ˈrad.d͡zo/, BUT razzolare is /rat.t͡soˈla.re/ .

The z, single or double, is one of the tricky ones to pronounce properly, in Italian they are usually called zeta dura and zeta dolce "hard z" and "sweet z".