IPA: /dɪˈsɜrnər/
KK: /dɪˈsɜrnər/
A person who is able to notice or understand things clearly, especially differences or important details.
As a discerner of truth, she could easily see through the lies.
Discerner → It is formed from "dis-" (meaning apart) and "cernere" (meaning to separate or distinguish). The word describes someone who separates or distinguishes between different things.
Think of someone who 'separates' ('cernere') things 'apart' ('dis-') — that's why a discerner is someone who distinguishes between different options.