Tom Collins vs highball

Tom Collins and highball both are nouns.

Word	Noun	Adjective	Verb	Adverb
Tom Collins	Yes	No	No	No
highball	Yes	No	No	No

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

Tom Collins: tall iced drink of liquor (usually gin) with fruit juice
highball: a mixed drink made of alcoholic liquor mixed with water or a carbonated beverage and served in a tall glass

Tom Collins (noun)	highball (noun)
tall iced drink of liquor (usually gin) with fruit juice	a mixed drink made of alcoholic liquor mixed with water or a carbonated beverage and served in a tall glass