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Ancient Greek βουκόλος
Proto-Celtic *boukolyos (cognate)
Mycenaean Greek 𐀦𐀄𐀒𐀫 (cognate)
Proto-Hellenic *gʷoukólos (inherited)
Proto-Indo-European *kʷel- (root)
Proto-Indo-European *gʷowkólos (inherited)
Proto-Indo-European *gʷṓws (mention)
Proto-Indo-European *kʷólos (mention)
Proto-Indo-European *kʷel- (mention)
Proto-Indo-European *gʷowkólos (cognate)

English boukólos rule (borrowed)
Breton bugel (cognate)
Welsh bugail (cognate)
Greek κόλον (link)
Spanish bucólico (mention)
Irish buachaill (cognate)
Ancient Greek βουκολικός (suffix)
Ancient Greek αἰπόλος (mention)
Ancient Greek ἐπιβουκόλος (affix)
Italian bucolico (mention)
Italian Bucolo (derived)
Portuguese bucólico (mention)
Old Irish búachaill (cognate)