This is the 5759th most frequent Arabic word.
مؤسس
Founder.
'مؤسس' (founder) here describes someone who originates or creates a principle or idea.
لقد كان مؤسسًا لإيديولوجيا الهدف المشترك.
He was a founder of the ideology of a common goal.
Here, 'مؤسس' (founder) is used as a noun to denote someone who establishes an entity.
علي هو المؤسس الرئيسي للشركة.
Ali is the main founder of the company.
In this sentence, 'مؤسس' (founder) describes a historical figure responsible for the inception of the city.