Similarly PIE/PGk *gʷ always became b and PIE *gʷʰ > PGk *kʰʷ always became ph (whereas in other dialects they became alternating b/d and ph/th before back/front vowels).

A Proto-Greek consonant cluster with h (from Indo-European *s) and a sonorant (r, l, n, m, w, y) changed to a double sonorant (rr, ll, nn, mm, ww, yy) in Lesbian and Thessalian (sub-dialects of Aeolic) by assimilation.

Lesbian Aeolic lost initial h- (psilosis "stripping") from Proto-Indo-European s- or y-.

In Thessalian and Boeotian (sub-dialects of Aeolic) and Doric, the Proto-Indo-European and Proto-Greek semi-vowel w (digamma) was retained at the beginning of a word.

In Boeotian, the vowel-system was, in many cases, changed in a way reminiscent of the modern Greek pronunciation.

In Lesbian Aeolic, the accent of all words is recessive (barytonesis), as is typical only in the verbs of other dialects.