rosemary vs herb

rosemary and herb both are nouns.

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

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

rosemary: extremely pungent leaves used fresh or dried as seasoning for especially meats
herb: aromatic potherb used in cookery for its savory qualities

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

rosemary: widely cultivated for its fragrant grey-green leaves used in cooking and in perfumery
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 rosemary include herbaceous plant.

rosemary (noun)	herb (noun)
extremely pungent leaves used fresh or dried as seasoning for especially meats	aromatic potherb used in cookery for its savory qualities
widely cultivated for its fragrant grey-green leaves used in cooking and in perfumery	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests