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