أخير

In a sentence

• وصل أخيراً الرجل الذي كنا ننتظره.

  Finally, the man we were waiting for arrived.

  Here, the word 'أخيراً' ('Finally') is used as an adverb to indicate the conclusion of a long wait.

• هذا هو الحل الأخير للمشكلة.

  This is the final solution to the problem.

  In this sentence, 'الأخير' ('final') functions as an adjective describing the last option or choice in a situation.

• من الفائز الأخير في المسابقة؟

  Who is the latest winner of the competition?

  Here, 'الأخير' ('latest') is used as an adjective to describe the most recent winner of the competition.