tree tobacco vs tobacco

tree tobacco and tobacco both are nouns.

Word	Noun	Adjective	Verb	Adverb
tree tobacco	Yes	No	No	No
tobacco	Yes	No	No	No

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

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

Other hypernyms of tree tobacco include tobacco plant.

tree tobacco (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