honey bun vs sweet roll

honey bun and sweet roll both are nouns.

Word	Noun	Adjective	Verb	Adverb
honey bun	Yes	No	No	No
sweet roll	Yes	No	No	No

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

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

Other hypernyms of honey bun include coffee roll.

honey bun (noun)	sweet 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