pocket bread vs flatbread

pocket bread and flatbread both are nouns.

Word	Noun	Adjective	Verb	Adverb
pocket bread	Yes	No	No	No
flatbread	Yes	No	No	No

As nouns, flatbread is a hypernym of pocket bread; that is, flatbread is a word with a broader meaning than pocket bread:

pocket bread: usually small round bread that can open into a pocket for filling
flatbread: any of various breads made from usually unleavened dough

pocket bread (noun)	flatbread (noun)
usually small round bread that can open into a pocket for filling	any of various breads made from usually unleavened dough