gem vs quick bread

gem and quick bread both are nouns.

Word	Noun	Adjective	Verb	Adverb
gem	Yes	No	No	No
quick bread	Yes	No	No	No

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

gem: a sweet quick bread baked in a cup-shaped pan
quick bread: breads made with a leavening agent that permits immediate baking

gem (noun)	quick bread (noun)
a precious or semiprecious stone incorporated into a piece of jewelry	breads made with a leavening agent that permits immediate baking
art highly prized for its beauty or perfection
a sweet quick bread baked in a cup-shaped pan
a person who is as brilliant and precious as a piece of jewelry
a crystalline rock that can be cut and polished for jewelry