Discerner

dis·cern  (d-sûrn, -zûrn)

v. dis·cerned, dis·cern·ing, dis·cerns

v.tr.

1. To perceive with the eyes or intellect; detect.

2. To recognize or comprehend mentally.

3. To perceive or recognize as being different or distinct; distinguish. See Synonyms at see¹.

v.intr.

To perceive differences.

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[Middle English discernen, from Old French discerner, from Latin discernere, to separate : dis-, apart; see dis- + cernere, to perceive; see krei- in Indo-European roots.]

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dis·cerner n.