thyme vs herbaceous plant

thyme and herbaceous plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
thyme	Yes	No	No	No
herbaceous plant	Yes	No	No	No

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

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

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