tobacco plant vs tobacco

tobacco plant and tobacco both are nouns.

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

As nouns, tobacco plant and tobacco are synonyms defined as:

tobacco plant and tobacco: aromatic annual or perennial herbs and shrubs

tobacco plant (noun)	tobacco (noun)
aromatic annual or perennial herbs and shrubs	leaves of the tobacco plant dried and prepared for smoking or ingestion
	aromatic annual or perennial herbs and shrubs