rowan vodka vs John Barleycorn

rowan vodka and John Barleycorn both are nouns.

Word	Noun	Adjective	Verb	Adverb
rowan vodka	Yes	No	No	No
John Barleycorn	Yes	No	No	No

As nouns, John Barleycorn is a hypernym of rowan vodka; that is, John Barleycorn is a word with a broader meaning than rowan vodka:

rowan vodka: a strong liquor made from rowan infusion with the addition of natural caramel, wine distillate and fruit distillates.
John Barleycorn: an alcoholic beverage that is distilled rather than fermented

Other hypernyms of rowan vodka include booze, hard drink, hard liquor, liquor, spirits, strong drink.

rowan vodka (noun)	John Barleycorn (noun)
a strong liquor made from rowan infusion with the addition of natural caramel, wine distillate and fruit distillates.	an alcoholic beverage that is distilled rather than fermented