One root, two faces that turn out to be the same face. נ־צ־ח means to prevail, and what prevails is what lasts. So the same letters give you victory (winning the battle) and eternity (winning against time). A surprising third sense rides along: the conductor who leads an orchestra is, in Hebrew, the one who makes the music prevail. Win, endure, conduct: three readings of the act of coming out on top.
The same root runs through the verb system. Each binyan is a voice: it bends the one idea into active, passive, causative or reciprocal. Tap to hear.
The active pa'al is not the lexical home of this root: the everyday verb "to win" lives in pi'el (לְנַצֵּחַ). The hif'il then adds the causative twist, to make something last forever. The passive binyanim are simply not lexicalized here.
Same root letters, different noun moulds (mishkalim). The mould tells you the function: who does it, the act of doing it, or the thing produced.
Strip the prefixes, suffixes and vowels. Three consonants remain, and the meaning lives there.