Translation guide
In Japanese, the word ジャグジー (jagujī) is a common loanword for a jacuzzi or whirlpool bath. However, it is often used more broadly to refer to any type of whirlpool bath or hot tub, not just the brand. In many contexts, especially at public baths or hot springs, the term 泡風呂 (awaburo) or ジェットバス (jettobasu) may be used. When referring to the experience, it's common to use phrases like 泡風呂に入る (awaburo ni hairu).
jacuzzi
Common loanword, but may be understood as any whirlpool bath.
Referring to a bathtub with jets that create bubbles and massage, often in a home or hotel.
The most direct loanword for 'jacuzzi'. Widely understood, especially in commercial contexts like hotels or spas. Note that it may be used generically for any whirlpool bath.
The hotel room had a jacuzzi.
Literally 'bubble bath'. Often used for baths with jets that produce bubbles, including jacuzzis. Common in public baths and hot springs.
I relaxed in the whirlpool bath at the hot spring.
Literally 'jet bath'. A more descriptive term for a bath with water jets. Used in technical or product descriptions.
We installed a new jet bath.
Describing the action of bathing in a jacuzzi.
Referring to the Jacuzzi brand as opposed to generic whirlpool baths.
When you need to specify the brand, you can say ジャグジー and clarify it's a trademark. In casual conversation, ジャグジー alone is usually understood generically.
This is a genuine Jacuzzi (trademark).
In Japanese, 泡風呂 can refer to any bath with bubbles, including those created by bath additives, not just mechanical jets. If you specifically mean a jacuzzi with jets, use ジャグジー or ジェットバス to avoid confusion.
Let's get in the whirlpool bath first, then go to the sauna.