caffein vs guaranine

caffein and guaranine both are nouns.

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

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

caffein: 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 caffein include theine.

caffein (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.