奴 is a bound form (b.f.) that cannot stand alone as a word — it always appears as part of compounds. Its core meaning is 'slave' or 'servant', and it also carries the verbal sense of enslaving or treating someone like a slave. Common compounds include 奴隶 (núlì, slave), 奴役 (núyì, to enslave), and 农奴 (nóngnú, serf). In historical contexts, 奴 often appears in terms for social classes or oppressive systems.