ما الفرق بين الواحد والأحد؟

Scholars differed on the distinction between "Al-Wahid" (the One) and "Al-Ahad" (the Unique/One and Only) across two views: The first holds that they are synonymous, carrying the same meaning, and that "Ahad" originates from "Wahad." The second view maintains that there is a difference between them, and that "Al-Ahad" is an attribute exclusive to Allah Almighty, not used to describe anyone else. They mentioned differences, including that "Al-Wahid" is encompassed within "Al-Ahad" but not the reverse, and that "Al-Wahid" is used in both affirmation and negation, whereas "Al-Ahad" is used only in negation.