piperine vs piperin

piperine and piperin both are nouns.

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

As nouns, piperine and piperin are synonyms defined as:

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

piperine (noun)	piperin (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