highball vs sling

highball and sling both are nouns.

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

As nouns, sling is a hyponym of highball; that is, sling 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
sling: a highball with liquor and water with sugar and lemon or lime juice

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

highball (noun)	sling (noun)
a mixed drink made of alcoholic liquor mixed with water or a carbonated beverage and served in a tall glass	bandage to support an injured forearm; consisting of a wide triangular piece of cloth hanging from around the neck
	a plaything consisting of a Y-shaped stick with elastic between the arms; used to propel small stones
	a simple weapon consisting of a looped strap in which a projectile is whirled and then released
	a shoe that has a strap that wraps around the heel
	a highball with liquor and water with sugar and lemon or lime juice

highball (verb)	sling (verb)
	hurl as if with a sling
	hold or carry in a sling
	move with a sling
	hang loosely or freely; let swing