Muffin and Sweet roll

Muffin noun - A sweet quick bread baked in a cup-shaped pan.

Sweet roll and muffin are semantically related in baked roll topic. In some cases you can use "Sweet roll" instead a noun "Muffin".

Sweet roll noun - Any of numerous yeast-raised sweet rolls with our without raisins or nuts or spices or a glaze.

Muffin and sweet roll are semantically related in baked roll topic. You can use "Muffin" instead a noun phrase "Sweet roll".