עָפַר

From LSJ

φωνὰ τύ τίς ἐσσι καὶ οὐδὲν ἄλλο → it's all voice you are, and nothing else | it's all voice ye are, and nought else

Source

English (Strong)

a primitive root: meaning either to be gray or perhaps rather to pulverize; used only as denominative from עָפָר, to be dust: cast (dust).