caffeine vs guaranine

caffeine and guaranine both are nouns.

Word	Noun	Adjective	Verb	Adverb
caffeine	Yes	No	No	No
guaranine	Yes	No	No	No

As nouns, guaranine is a hyponym of caffeine; that is, guaranine is a word with a more specific, narrower meaning than caffeine:

caffeine: a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects
guaranine: Guaranine is the name used to describe caffeine derived from the guarana plant.

Other hyponyms of caffeine include theine.

caffeine (noun)	guaranine (noun)
a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects	Guaranine is the name used to describe caffeine derived from the guarana plant.