sawwort vs herb

sawwort and herb both are nouns.

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

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

sawwort: European perennial whose serrate leaves yield a yellow dye
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 sawwort include herbaceous plant.

sawwort (noun)	herb (noun)
European perennial whose serrate leaves yield a yellow dye	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