dittany vs herb

dittany and herb both are nouns.

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

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

dittany: Eurasian perennial herb with white flowers that emit flammable vapor in hot weather
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 dittany include herbaceous plant.

dittany (noun)	herb (noun)
Eurasian perennial herb with white flowers that emit flammable vapor in hot weather	aromatic potherb used in cookery for its savory qualities
	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests