sang vs herb

sang and herb both are nouns.

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

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

sang: North American woodland herb similar to and used as substitute for the Chinese ginseng
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 sang include herbaceous plant.

sang (noun)	herb (noun)
North American woodland herb similar to and used as substitute for the Chinese ginseng	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