herb vs flavouring

herb and flavouring both are nouns.

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

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

Other hypernyms of herb include flavorer, flavoring, flavourer, seasoner, seasoning.

herb (noun)	flavouring (noun)
aromatic potherb used in cookery for its savory qualities	something added to food primarily for the savor it imparts
a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests