metal glove vs glove

metal glove and glove both are nouns.

Word	Noun	Adjective	Verb	Adverb
metal glove	Yes	No	No	No
glove	Yes	No	No	No

As nouns, glove is a hypernym of metal glove; that is, glove is a word with a broader meaning than metal glove:

metal glove (noun)	glove (noun)
a glove of armored leather; protects the hand	handwear: covers the hand and wrist
	the handwear used by fielders in playing baseball
	boxing equipment consisting of big and padded coverings for the fists of the fighters; worn for the sport of boxing