alumbloom vs herb

alumbloom and herb both are nouns.

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

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

alumbloom: any of several herbs of the genus Heuchera
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 alumbloom include herbaceous plant.

alumbloom (noun)	herb (noun)
any of several herbs of the genus Heuchera	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