Brussels biscuit vs twice-baked bread

Brussels biscuit and twice-baked bread both are nouns.

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

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

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

Other synonyms of Brussels biscuit include rusk, zwieback.

Brussels biscuit (noun)	twice-baked bread (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