There are a number of synonyms for the term "suit jacket," including blazer, sports jacket, and sport coat. These terms are often used interchangeably, but they do have some subtle differences in terms of style and formality. For example, while a blazer usually refers to a more tailored and structured jacket made from a heavier fabric, a sports jacket typically has a looser fit, a softer construction, and may incorporate more casual fabrics like tweed. Similarly, a sport coat can refer to a wider range of styles, from formal wool jackets to more casual cotton or linen options. Ultimately, the best synonym for the term "suit jacket" will depend on the occasion and your individual style preferences.