unleavened bread vs matzah

unleavened bread and matzah both are nouns.

Word	Noun	Adjective	Verb	Adverb
unleavened bread	Yes	No	No	No
matzah	Yes	No	No	No

As nouns, unleavened bread and matzah are synonyms defined as:

Other synonyms of unleavened bread include matzo, matzoh.

unleavened bread (noun)	matzah (noun)
brittle flat bread eaten at Passover	brittle flat bread eaten at Passover