The term 'Jacuzzi Features' refers to the features of a Jacuzzi, which is a type of hot tub. The two solutions for this term are 'JETS' and 'ZEES, ' both of which are four letters long. JETS refers to the JETS of water that are built into the sides of the Jacuzzi, which provide a massage-like sensation when turned on. ZEES refers to the air bubbles that are also built into the sides of the Jacuzzi, which provide a bubbling sensation when turned on.