dwarf nipplewort vs herb

dwarf nipplewort and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
dwarf nipplewort	Yes	No	No	No
herb	Yes	No	No	No

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

dwarf nipplewort: small European herb with small yellow flowers
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 dwarf nipplewort include herbaceous plant.

dwarf nipplewort (noun)	herb (noun)
small European herb with small yellow flowers	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