The term 'DIVA'S SPECIALTY' can be solved by the crossword solution ARIA, which is a four letter word. An ARIA is a type of song or musical composition that is typically featured in operas and other classical music pieces. It is usually sung by a solo vocalist, often referred to as a diva, and is usually accompanied by an orchestra. Arias are known for their dramatic and passionate nature, making them a specialty of divas.