common cockscomb vs herb

common cockscomb and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
common cockscomb	Yes	No	No	No
herb	Yes	No	No	No

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

common cockscomb: garden annual with featherlike spikes of red or 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 common cockscomb include herbaceous plant.

common cockscomb (noun)	herb (noun)
garden annual with featherlike spikes of red or 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