柔 is a bound morpheme (黏着语素) meaning 'soft', 'supple', or 'gentle'. It rarely appears alone; instead, it combines with another character to form common compounds like 温柔 (wēnróu, gentle), 柔软 (róuruǎn, soft/pliable), 柔和 (róuhé, soft/gentle), or 柔韧 (róurèn, flexible/tough). You can also find it in a verb-like role meaning 'to soften' (e.g., 柔化 róuhuà). Because it is bound, you must use it inside a compound in real sentences.