fines herbes vs herb

fines herbes and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
fines herbes	Yes	No	No	No
herb	Yes	No	No	No

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

fines herbes (noun)	herb (noun)
a mixture of finely chopped fresh herbs	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