Nicotiana glauca vs tobacco

Nicotiana glauca and tobacco both are nouns.

Word	Noun	Adjective	Verb	Adverb
Nicotiana glauca	Yes	No	No	No
tobacco	Yes	No	No	No

As nouns, tobacco is a hypernym of Nicotiana glauca; that is, tobacco is a word with a broader meaning than Nicotiana glauca:

Nicotiana glauca: evergreen South American shrub naturalized in United States; occasionally responsible for poisoning livestock
tobacco: aromatic annual or perennial herbs and shrubs

Other hypernyms of Nicotiana glauca include tobacco plant.

Nicotiana glauca (noun)	tobacco (noun)
evergreen South American shrub naturalized in United States; occasionally responsible for poisoning livestock	leaves of the tobacco plant dried and prepared for smoking or ingestion
	aromatic annual or perennial herbs and shrubs