Zingiber officinale vs stem ginger

Zingiber officinale and stem ginger both are nouns.

Word	Noun	Adjective	Verb	Adverb
Zingiber officinale	Yes	No	No	No
stem ginger	Yes	No	No	No

As nouns, Zingiber officinale and stem ginger are synonyms defined as:

Zingiber officinale and stem ginger: tropical Asian plant widely cultivated for its pungent root; source of gingerroot and powdered ginger

Other synonyms of Zingiber officinale include Canton ginger, common ginger.

Zingiber officinale (noun)	stem ginger (noun)
tropical Asian plant widely cultivated for its pungent root; source of gingerroot and powdered ginger	tropical Asian plant widely cultivated for its pungent root; source of gingerroot and powdered ginger