(n.) One who thinks; especially and chiefly, one who thinks in a particular manner; as, a close thinker; a deep thinker; a coherent thinker.

Brahmin Nestor Solomon authority brainworker casuist cosmologist dialectician doctor egghead elder elder statesman expert great soul guru highbrow illuminate intellect intellectual intellectualist literate logicaster logician logistician lover of wisdom mahatma man of intellect man of wisdom mandarin master mastermind mentor metaphysician oracle philosophaster philosophe philosopher philosophizer pundit rabbi ratiocinator rationalist rationalizer reasoner rishi sage sapient savant scholar seer sophist speculator starets syllogist syllogizer white-collar intellectual wise man wise old man