Q. *vistë [w] n. “change” (Category: to Change)
This word is unattested, but there is indirect evidence for it as an element of walwistë “change of mind” (PE17/189). This word likely contains the archaic form †wistë from before the change of w- to v-. Its modern form would be *vistë. If you accept inwist- as the stem form of inwis “change of mind”, it likely contains †wistë as well.
There is another attested word wirne with the gloss “change” (PE17/191), but I think it is likelier to be the archaic form of the strong-past tense of the verb virya- instead of a noun.
Reference ✧ PE17/189 ✧ #wiste “change”
Element In
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| √WIS > #wiste | [wiste] > [βiste] > [viste] | ✧ PE17/189 |