bran muffin vs gem

bran muffin and gem both are nouns.

Word	Noun	Adjective	Verb	Adverb
bran muffin	Yes	No	No	No
gem	Yes	No	No	No

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

Other hypernyms of bran muffin include muffin.

bran muffin (noun)	gem (noun)
muffin containing bran	a precious or semiprecious stone incorporated into a piece of jewelry
	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