We use the words if we need to be specific but they are all 'tops' in British English anyway.

Sweatshirt / Jumper / Hoodie are basically the same. (A hoodie must have a hood, but sweatshirt and jumper might not have a hood) Americans don't use the word Jumper. A sweater is often a higher quality, and it usually made with a different method and material. A blouse is in a different category. A blouse will not keep you warm. Good luck!

All of these do have slight differences from each other depending on where you come from. The explanation I am about to give is not true 100% of the time, but in general: Sweater - Usually nicer or more formal. Maybe wear it to a dinner party. Jumper - More commonly used in Australia and England, but also means sweater. Pullover - Commonly thought of in America as a light jacket made of fleece or some other warm fabric that has no zipper, so you must pull it over your head. Sweatshirt - A less formal sweater. Many people who work outside will wear a sweatshirt in the cooler months. They are usually made of a more durable or rugged material than a sweater. Hoodie - A sweatshirt that has a hood attached to it. You will see many people who work outside wearing these during the fall and early spring months. They are usually made of durable materials and the hood helps keep the wind away from your face. Blouse - This is more commonly used for a woman's sweater. Again, these answers are not true 100% of the time, but most people where I come from ( the northeast of America ) would use these definitions.

So a sweater, sweatshirt, and blouse are all just shirts. In America, a sweatshirt and sweater are the same thing, they're long sleeve shirts meant to keep you warm in colder months. A blouse is female clothing with longer sleeves, but isn't entirely made to keep you warm. More of a long sleeve you could wear in spring. A jumper is a sweater in Britain, but here in America, a jumper is a sleeveless dress worn over a blouse, they were made for each other almost. As well, in America, pullovers are just sweaters. A sweater with a front opening is just something we'd call a cardigan, if it has a zipper and/or hood, we call it a jacket. Further, depending on the length of the jacket's waist, we call it a coat. But coat and jacket are used interchangeably, no need to be so specific with lengths. Hoodies are a combo of jackets and sweaters. It's a sweater with a hood. In short: (Sweater/pullover/British jumper, cardigan, jacket/coat/hoodie) All meant for colder weather, with slight differences, mostly being the presence or absence of hoods and zippers. (Blouse, American jumper) Fashionable, could be worn year-round, but is mostly worn during spring.

A jumper is also an article of clothes in the US but isn’t related to the others. It’s a kind of dress.