piperin vs piperine

piperin and piperine both are nouns.

Word	Noun	Adjective	Verb	Adverb
piperin	Yes	No	No	No
piperine	Yes	No	No	No

As nouns, piperin and piperine are synonyms defined as:

piperin and piperine: derived from pepper (especially black pepper); source of the hotness of black and white pepper

piperin (noun)	piperine (noun)
derived from pepper (especially black pepper); source of the hotness of black and white pepper	derived from pepper (especially black pepper); source of the hotness of black and white pepper