highball vs julep

highball and julep both are nouns.

Word	Noun	Adjective	Verb	Adverb
highball	Yes	No	No	No
julep	Yes	No	No	No

As nouns, julep is a hyponym of highball; that is, julep is a word with a more specific, narrower meaning than highball:

highball: a mixed drink made of alcoholic liquor mixed with water or a carbonated beverage and served in a tall glass
julep: bourbon and sugar and mint over crushed ice

Other hyponyms of highball include cobbler, collins, Tom Collins, gin and tonic, mint julep, Scotch and soda, sling, zombi, zombie.

highball (noun)	julep (noun)
a mixed drink made of alcoholic liquor mixed with water or a carbonated beverage and served in a tall glass	bourbon and sugar and mint over crushed ice