A passenger ship designed for pleasure voyages, often with onboard entertainment and amenities.
A new cruise ship is scheduled to enter service next year.
They enjoyed a round-the-world trip on a cruise ship.
客船 is a general term for passenger ships, including ferries and liners, while 巡航客船 specifically refers to cruise ships designed for leisure voyages.
クルーズ船 is a common katakana loanword for 'cruise ship', often used interchangeably with 巡航客船 in modern Japanese.
Compound of 巡航 (cruising) and 客船 (passenger ship). The exact historical derivation is uncertain, but the term is a straightforward modern compound.