smoothie vs beverage

smoothie and beverage both are nouns.

Word	Noun	Adjective	Verb	Adverb
smoothie	Yes	No	No	No
beverage	Yes	No	No	No

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

smoothie: a thick smooth drink consisting of fresh fruit pureed with ice cream or yoghurt or milk
beverage: any liquid suitable for drinking

Other hypernyms of smoothie include drink, drinkable, potable.

smoothie (noun)	beverage (noun)
a thick smooth drink consisting of fresh fruit pureed with ice cream or yoghurt or milk	any liquid suitable for drinking
someone with an assured and ingratiating manner