What is another word for mainsail?
Pronunciation: [mˈe͡ɪnse͡ɪl] (IPA) 
The mainsail is an essential component of a sailboat or sailship, which helps in propelling the vessel forward by catching the wind. Some synonyms for the mainsail include the primary sail, the largest sail, the mainstay sail, the driving sail, the fore-and-aft sail, and the trapezoidal sail. Other terms that are used interchangeably include the boom sail, the main canvas, the main sheet, and the mainsheet. Depending on the vessel's size, design, and purpose, different types of mainsails may be used, such as a full-batten mainsail, a loose-footed mainsail, a roller-furling mainsail, or a battened mainsail. Each type has its advantages and disadvantages depending on the weather condition and sailing style.
