tobacco vs herbaceous plant

tobacco and herbaceous plant both are nouns.

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

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

tobacco: aromatic annual or perennial herbs and shrubs
herbaceous plant: a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests

Other hypernyms of tobacco include herb.

tobacco (noun)	herbaceous plant (noun)
leaves of the tobacco plant dried and prepared for smoking or ingestion	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests
aromatic annual or perennial herbs and shrubs