mint julep vs highball

mint julep and highball both are nouns.

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

As nouns, highball is a hypernym of mint julep; that is, highball is a word with a broader meaning than mint julep:

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

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