piperin vs chemical irritant

piperin and chemical irritant both are nouns.

Word	Noun	Adjective	Verb	Adverb
piperin	Yes	No	No	No
chemical irritant	Yes	No	No	No

As nouns, chemical irritant is a hypernym of piperin; that is, chemical irritant is a word with a broader meaning than piperin:

piperin: derived from pepper (especially black pepper); source of the hotness of black and white pepper
chemical irritant: a substance producing irritation

piperin (noun)	chemical irritant (noun)
derived from pepper (especially black pepper); source of the hotness of black and white pepper	a substance producing irritation