pteropogon vs herb

pteropogon and herb both are nouns.

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

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

pteropogon: southern Australian plant having feathery hairs surrounding the fruit
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 pteropogon include herbaceous plant.

pteropogon (noun)	herb (noun)
southern Australian plant having feathery hairs surrounding the fruit	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