Alpinia purpurata vs red ginger

Alpinia purpurata and red ginger both are nouns.

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

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

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

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