Synonyms of 'thinker'
philosopherDictionary, intellect (informal) , wise man
some of the world's greatest thinkers
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I've never been much of a brain myself.
If you describe someone as an intellect, you mean that they are very intelligent.
My boss isn't a great intellect.
The mastermind behind a difficult or complicated plan, often a criminal one, is the person who is responsible for planning and organizing it.
He was the mastermind behind the plan.
Thesaurus for thinker from the Collins English Thesaurus
A thinker is a person who spends a lot of time thinking deeply about important things, especially someone who is famous for thinking of new or interesting ideas.