sarsaparilla vs soft drink

sarsaparilla and soft drink both are nouns.

Word	Noun	Adjective	Verb	Adverb
sarsaparilla	Yes	No	No	No
soft drink	Yes	No	No	No

As nouns, soft drink is a hypernym of sarsaparilla; that is, soft drink is a word with a broader meaning than sarsaparilla:

sarsaparilla: carbonated drink flavored with an extract from sarsaparilla root or with birch oil and sassafras
soft drink: nonalcoholic beverage (usually carbonated)

sarsaparilla (noun)	soft drink (noun)
carbonated drink flavored with an extract from sarsaparilla root or with birch oil and sassafras	nonalcoholic beverage (usually carbonated)
any of various prickly climbing plants of the tropical American genus Smilax having aromatic roots and heart-shaped leaves