Piper nigrum vs Madagascar pepper

Piper nigrum and Madagascar pepper both are nouns.

Word	Noun	Adjective	Verb	Adverb
Piper nigrum	Yes	No	No	No
Madagascar pepper	Yes	No	No	No

As nouns, Piper nigrum and Madagascar pepper are synonyms defined as:

Piper nigrum and Madagascar pepper: climber having dark red berries (peppercorns) when fully ripe; southern India and Sri Lanka; naturalized in northern Burma and Assam

Other synonyms of Piper nigrum include black pepper, common pepper, pepper, white pepper.

Piper nigrum (noun)	Madagascar pepper (noun)
climber having dark red berries (peppercorns) when fully ripe; southern India and Sri Lanka; naturalized in northern Burma and Assam	climber having dark red berries (peppercorns) when fully ripe; southern India and Sri Lanka; naturalized in northern Burma and Assam