Nicotiana tabacum vs common tobacco

Nicotiana tabacum and common tobacco both are nouns.

Word	Noun	Adjective	Verb	Adverb
Nicotiana tabacum	Yes	No	No	No
common tobacco	Yes	No	No	No

As nouns, Nicotiana tabacum and common tobacco are synonyms defined as:

Nicotiana tabacum and common tobacco: tall erect South American herb with large ovate leaves and terminal clusters of tubular white or pink flowers; cultivated for its leaves

Nicotiana tabacum (noun)	common tobacco (noun)
tall erect South American herb with large ovate leaves and terminal clusters of tubular white or pink flowers; cultivated for its leaves	tall erect South American herb with large ovate leaves and terminal clusters of tubular white or pink flowers; cultivated for its leaves