A verb for “to change” appearing in notes from the 1950s implied by its past tense form ahyanë “did change” in the phrase manen lambë Quendion ahyanë “How did the language of the Elves change?” (PM/395).
Quenya
ahya-
verb. change
ahya-
verb. to change
virya-
verb. change, alter(nate)
virya- (2) vb. "change, alter(nate)" (intransitive), pa.t. virnë/virinyë, cf. transitive vista-, q.v. (PE17:189, 191)
vista-
verb. 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
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 wirnë 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.
wistë Reconstructed
noun. change
#ahya- vb. "change" (intransitive), only attested in the past tense: ahyanë (PM:395)