Martynia fragrans vs herb

Martynia fragrans and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
Martynia fragrans	Yes	No	No	No
herb	Yes	No	No	No

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

Martynia fragrans: a herbaceous plant of the genus Proboscidea
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 Martynia fragrans include herbaceous plant.

Martynia fragrans (noun)	herb (noun)
a herbaceous plant of the genus Proboscidea	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