red ginger vs Alpinia purpurata

red ginger and Alpinia purpurata both are nouns.

Word	Noun	Adjective	Verb	Adverb
red ginger	Yes	No	No	No
Alpinia purpurata	Yes	No	No	No

As nouns, red ginger and Alpinia purpurata are synonyms defined as:

red ginger and Alpinia purpurata: an ornamental ginger native to Pacific islands

red ginger (noun)	Alpinia purpurata (noun)
an ornamental ginger native to Pacific islands	an ornamental ginger native to Pacific islands