嗯 嗯 en1
(a groaning sound)

嗯 嗯 en4
(nonverbal grunt as interjection); OK, yeah; what?

嗯 嗯 en5
interjection indicating approval, appreciation or agreement

strokes 13
radical
口
口
strokes after radical 10
嗯哼 嗯哼 en5 heng1
uh-huh