fruit drink vs beverage

fruit drink and beverage both are nouns.

Word	Noun	Adjective	Verb	Adverb
fruit drink	Yes	No	No	No
beverage	Yes	No	No	No

As nouns, beverage is a hypernym of fruit drink; that is, beverage is a word with a broader meaning than fruit drink:

Other hypernyms of fruit drink include drink, drinkable, potable.

fruit drink (noun)	beverage (noun)
a sweetened beverage of diluted fruit juice	any liquid suitable for drinking