The correspondences between PEC and PWC, in what concerns the timbre features, are regular in any case (note the palatalisation + labialisation in PWC, which can correspond both to *ü and to *qw + *e in PEC). In PWC, however, we would expect a form like *q:́ʷa (with tense *q:) corresponding to a long vowel in PEC. This discrepancy is still to be explained, but of course it does not make the comparison less valid.
See Trubetzkoy 1930, 276, Abdokov 1983, 105.
There is also a possible (but very problematic) Kartvelian parallel: Georg. (m)sχali, Megr. sχuli, Chan. cχuli, Svan. icχi 'pear' (see Charaya 1912, 26; Gudava 1954, 706-707).
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