ouzo vs John Barleycorn

ouzo and John Barleycorn both are nouns.

Word	Noun	Adjective	Verb	Adverb
ouzo	Yes	No	No	No
John Barleycorn	Yes	No	No	No

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

ouzo: a Greek liquor flavored with anise
John Barleycorn: an alcoholic beverage that is distilled rather than fermented

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

ouzo (noun)	John Barleycorn (noun)
a Greek liquor flavored with anise	an alcoholic beverage that is distilled rather than fermented