twice-baked bread vs Brussels biscuit

twice-baked bread and Brussels biscuit both are nouns.

Word	Noun	Adjective	Verb	Adverb
twice-baked bread	Yes	No	No	No
Brussels biscuit	Yes	No	No	No

As nouns, twice-baked bread and Brussels biscuit are synonyms defined as:

twice-baked bread and Brussels biscuit: slice of sweet raised bread baked again until it is brown and hard and crisp

Other synonyms of twice-baked bread include rusk, zwieback.

twice-baked bread (noun)	Brussels biscuit (noun)
slice of sweet raised bread baked again until it is brown and hard and crisp	slice of sweet raised bread baked again until it is brown and hard and crisp