Alpinia galanga vs galangal

Alpinia galanga and galangal both are nouns.

Word	Noun	Adjective	Verb	Adverb
Alpinia galanga	Yes	No	No	No
galangal	Yes	No	No	No

As nouns, Alpinia galanga and galangal are synonyms defined as:

Alpinia galanga and galangal: southeastern Asian perennial with aromatic roots

Alpinia galanga (noun)	galangal (noun)
southeastern Asian perennial with aromatic roots	southeastern Asian perennial with aromatic roots
	European sedge having rough-edged leaves and spikelets of reddish flowers and aromatic roots