Answer: BUB

AnswerCrossword Clue
BUB"Hey, ...!" ("Hey, fella!")
BUBFamiliar word of address.
BUBRelative of Mac or pal
BUBSonny
BUBAny old Joe
BUB"Hey, .....!" ("Hey, fella!")
BUBBuster or fella
BUB"Mac" alternative
BUBKin of "mac"
BUBLittle fellow.
BUBFella relative
BUBHowdy, ...!: pal
BUBKiddo
BUBBuster, mac or fella
BUBCondescending term of address
BUBMac alternative
bub(used as an often insolent term of address) brother; buddy
buba young fellow
BUBDude
BUB"Mac"
BUBFella
BUBImpolite alternative to "sir"
BUBBuddy
BUBBuster
BUBBro
BUBChum
BUBFellow
BUBMac
BUBFrequently insolent alternative to "sir"
BUB"My Three Sons" role
BUBAddress to a fella
BUBPal
BUBInsolent appellation
BUBSmall boy.
BUBBrother.