juice vs V-8 juice

juice and V-8 juice both are nouns.

Word	Noun	Adjective	Verb	Adverb
juice	Yes	No	No	No
V-8 juice	Yes	No	No	No

As nouns, V-8 juice is a hyponym of juice; that is, V-8 juice is a word with a more specific, narrower meaning than juice:

juice: the liquid part that can be extracted from plant or animal tissue by squeezing or cooking
V-8 juice: brand name for canned mixed vegetable juices

Other hyponyms of juice include gravy, pan gravy, lemon juice, lime juice, papaya juice, tomato juice, carrot juice.

juice (noun)	V-8 juice (noun)
any of several liquids of the body	brand name for canned mixed vegetable juices
the liquid part that can be extracted from plant or animal tissue by squeezing or cooking
electric current
energetic vitality