Shagirov (1, 94 - 95) relates PAK *bzǝ́jǝ to *bza "tongue"; the two roots may indeed have contaminated within some compounds, but originally have been, of course, quite different. The form *bzǝ́jǝ is also used in Kab. to denote "maize stalk" and both in Ad. and Kab. within the form Ad. q:ā-mzǝj, Kab. q:ā-bzij "bird's feather" which Shagirov (1, 679) plausibly explains as a distortion of q:az-bzǝj(ǝ) "goose feather" (q:az < Turk. qaz 'goose').