philosopher
US /fɪˈlɑː.sə.fɚ/
UK /fɪˈlɑː.sə.fɚ/

1.
a person engaged or learned in philosophy, especially as an academic discipline.
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Plato was a renowned ancient Greek philosopher.
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She studied the works of many modern philosophers.
2.
a person who regulates his or her life, actions, and judgments by the dictates of reason.
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He lives like a true philosopher, always seeking wisdom and inner peace.
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Despite the challenges, she maintained a calm and collected demeanor, like a seasoned philosopher.