[nob] n [prob. alter. of knob] (ca. 1700) 1: head 1
2: a jack of the same suit as the starter in cribbage that scores one point for the holder--usu. used in the phrases his nob or his nobs
[2]nob n [perh. fr. [1]nob] (1703) chiefly Brit: one in a superior position in life