Noun:

যে ব্যক্তি সিদ্ধান্ত করে,

theoreticians's Usage Examples:

been among the strongest ones, and one of the most influential chess theoreticians of the late 19th and early 20th century.

Turkish-German Cinema historians and theoreticians of film sometimes call movies out of Germany directed by German-Turkish filmmakers.

representatives of the bourgeois class, so the Socialists and Communists are the theoreticians of the proletarian class.

Synonyms:

theorizer; intellectual; intellect; theoriser; idealogue; theorist;

Antonyms:

unscholarly; physical; intellectual; nonintellectual; stupidity;