tread-softly vs herb

tread-softly and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
tread-softly	Yes	No	No	No
herb	Yes	No	No	No

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

tread-softly: a stinging herb of tropical America
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 tread-softly include herbaceous plant.

tread-softly (noun)	herb (noun)
a stinging herb of tropical America	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