caramel bun vs coffee roll

caramel bun and coffee roll both are nouns.

Word	Noun	Adjective	Verb	Adverb
caramel bun	Yes	No	No	No
coffee roll	Yes	No	No	No

As nouns, coffee roll is a hypernym of caramel bun; that is, coffee roll is a word with a broader meaning than caramel bun:

caramel bun: rolled dough spread with sugar and nuts then sliced and baked in muffin tins with honey or sugar and butter in the bottom
coffee roll: any of numerous yeast-raised sweet rolls with our without raisins or nuts or spices or a glaze

Other hypernyms of caramel bun include sweet roll.

caramel bun (noun)	coffee roll (noun)
rolled dough spread with sugar and nuts then sliced and baked in muffin tins with honey or sugar and butter in the bottom	any of numerous yeast-raised sweet rolls with our without raisins or nuts or spices or a glaze