discerner

n. one who has the power of distinguishing,one who passes judgement,person of judgement,crit-ic有识别力的人，做出判断的人，判断者，批评家。
△H.VIII.1. 1.32: “and no discerner / Durst wag his tongue incensure. ”i.e. No one dared to single out either as su-perior to the other. 没有哪个人敢摇嘴弄舌判断优劣。