stevia vs herb

stevia and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
stevia	Yes	No	No	No
herb	Yes	No	No	No

As nouns, herb is a hypernym of stevia; that is, herb is a word with a broader meaning than stevia:

stevia: any plant of the genus Stevia or the closely related genus Piqueria having glutinous foliage and white or purplish flowers; Central and South America
herb: a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests

Other hypernyms of stevia include herbaceous plant.

As nouns, herb is a hypernym of stevia; that is, herb is a word with a broader meaning than stevia:

stevia: any plant of the genus Piqueria or the closely related genus Stevia
herb: a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests

Other hypernyms of stevia include herbaceous plant.

stevia (noun)	herb (noun)
any plant of the genus Stevia or the closely related genus Piqueria having glutinous foliage and white or purplish flowers; Central and South America	aromatic potherb used in cookery for its savory qualities
any plant of the genus Piqueria or the closely related genus Stevia	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests