The word for ‘sweater’ in Spanish is ‘suéter’.
‘Suéter’ is a noun and it is used in many Spanish-speaking countries to refer to a knitted garment worn on the upper body. In some regions, you might also hear people use the word ‘jersey’ to describe a sweater, but ‘suéter’ is the most commonly used term.
When learning a new language, it’s helpful to not only memorize vocabulary but also to see how it fits into sentences. For example, you could say, ‘Me pongo un suéter porque hace frío’ which means ‘I put on a sweater because it is cold.’