wine bottle vs magnum

wine bottle and magnum both are nouns.

Word	Noun	Adjective	Verb	Adverb
wine bottle	Yes	No	No	No
magnum	Yes	No	No	No

As nouns, magnum is a hyponym of wine bottle; that is, magnum is a word with a more specific, narrower meaning than wine bottle:

Other hyponyms of wine bottle include bota, double-magnum, jeroboam, nebuchadnezzar.

wine bottle (noun)	magnum (noun)
a bottle for holding wine	a large wine bottle for liquor or wine