quinine water vs tonic water

quinine water and tonic water both are nouns.

Word	Noun	Adjective	Verb	Adverb
quinine water	Yes	No	No	No
tonic water	Yes	No	No	No

As nouns, quinine water and tonic water are synonyms defined as:

quinine water and tonic water: lime- or lemon-flavored carbonated water containing quinine

Other synonyms of quinine water include tonic.

quinine water (noun)	tonic water (noun)
lime- or lemon-flavored carbonated water containing quinine	lime- or lemon-flavored carbonated water containing quinine