Lotus tetragonolobus vs herb

Lotus tetragonolobus and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lotus tetragonolobus	Yes	No	No	No
herb	Yes	No	No	No

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

Lotus tetragonolobus: sprawling European annual having a 4-winged edible pod
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 Lotus tetragonolobus include herbaceous plant.

Lotus tetragonolobus (noun)	herb (noun)
sprawling European annual having a 4-winged edible pod	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