Buns and Sweet roll

Buns noun - The part of the body upon which someone sits.

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

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

Buns and sweet roll are semantically related. Sometimes you can replace term "Buns" with "Sweet roll", this terms are similar.