Japanese barberry vs Berberis thunbergii

Japanese barberry and Berberis thunbergii both are nouns.

Word	Noun	Adjective	Verb	Adverb
Japanese barberry	Yes	No	No	No
Berberis thunbergii	Yes	No	No	No

As nouns, Japanese barberry and Berberis thunbergii are synonyms defined as:

Japanese barberry and Berberis thunbergii: compact deciduous shrub having persistent red berries; widespread in cultivation especially for hedges

Japanese barberry (noun)	Berberis thunbergii (noun)
compact deciduous shrub having persistent red berries; widespread in cultivation especially for hedges	compact deciduous shrub having persistent red berries; widespread in cultivation especially for hedges