ཕུ་ནུ།

According to Beyer 1991: 158, phu and nu in phu bo (“older brother of a man”) and nu bo (“younger brother of a man” (with their secondary derivatives phu mo “older sister of a woman” and nu mo “younger sister of a woman”) is etymologically related to phud “first fruit” and nu to nud “suckling.” This might require verification.