Felechosa's dialect of the Asturian Language is known for distinguishing masculine singular nouns from mass nouns by raising the stressed vowel, with mid vowels becoming high and /a/ becoming /e/.[1] This extends to the adjective paradigm, with the word for "good" declining as [bwino] in the masculine singular rather than [bwenu] as in other dialects of Asturian.
References
^Mascaró, Joan; Torres-Tamarit, Francesc (2022). "Stress-dependent harmony in Asturian and harmony in situ". Language (Baltimore). 98: 683–715.