ahya-

change

#ahya- vb. "change" (intransitive), only attested in the past tense: ahyanë (PM:395)

ahya-

verb. to change

virya-

change, alter(nate)

virya- (2) vb. "change, alter(nate)" (intransitive), pa.t. virnë/virinyë, cf. transitive vista-, q.v. (PE17:189, 191)

vista-

change

vista- (2) vb. "change" (transitive), pa.t. vistanë, cf. intransitive virya-, q.v. (PE17:189, 191)

wirnë

change

wirnë noun? "change" (PE17:191)

wirnë

noun. change

@@@ Despite its gloss, wirnë might be the archaic strong past tense of virya-: it is almost identical to the strong past tense form on PE17/189. For a noun form, vistë may be preferable.

wistë

noun. change

vistë Reconstructed

noun. 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.