herb vs waldmeister

herb and waldmeister both are nouns.

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

As nouns, waldmeister is a hyponym of herb; that is, waldmeister is a word with a more specific, narrower meaning than herb:

herb (noun)	waldmeister (noun)
aromatic potherb used in cookery for its savory qualities	fragrant dark green leaves used to flavor May wine
a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests	Old World fragrant stoloniferous perennial having small white flowers and narrow leaves used as flavoring and in sachets; widely cultivated as a ground cover; in some classifications placed in genus Asperula