uncle A1

/ˈʌŋ.kl̩/ The brother of your mother or father, or your aunt's husband.

avuncular C2+

/əˈvʌŋkjələr/ kind and genial in the manner of an uncle

nuncle C2+

/ˈnʌŋkəl/ uncle (archaic, especially as used by a fool to a master)