Crewneck Sweatshirt

Refers to the neckline style itself. It's a classic round neckline that sits comfortably around the base of your neck.

Crewnecks can be made from a variety of materials, including fleece, cotton, wool, and cashmere.

They can be thin or thick, depending on the material and purpose.

Thinner crewnecks can be worn on their own or layered under jackets or sweaters. Thicker crewnecks made from fleece or sweatshirt material are designed to provide warmth.

Crewneck Sweatshirt can have a more polished or casual look depending on the material and overall outfit.

Sweatshirt

Typically refers to a thicker top made from sweatshirt fleece, a material known for its softness and warmth on the inside, and a smoother knit on the outside.

Sweatshirts almost always have a crewneck neckline, but they can also come in v-neck or hooded styles (hoodies).

Designed for comfort and warmth, sweatshirts are a casual clothing item.

In essence:

Crewneck describes the neckline style (round) and can be found on various tops.

Sweatshirt refers to a type of casual top typically made from sweatshirt fleece with a crewneck neckline (but can also be v-neck or hooded).