thyme vs herb

thyme and herb both are nouns.

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

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

thyme: leaves can be used as seasoning for almost any meat and stews and stuffings and vegetables
herb: aromatic potherb used in cookery for its savory qualities

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

thyme: any of various mints of the genus Thymus
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 thyme include herbaceous plant.

thyme (noun)	herb (noun)
leaves can be used as seasoning for almost any meat and stews and stuffings and vegetables	aromatic potherb used in cookery for its savory qualities
any of various mints of the genus Thymus	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests