zwieback vs twice-baked bread

zwieback and twice-baked bread both are nouns.

Word	Noun	Adjective	Verb	Adverb
zwieback	Yes	No	No	No
twice-baked bread	Yes	No	No	No

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

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

Other synonyms of zwieback include Brussels biscuit, rusk.

zwieback (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