fetid horehound vs black archangel

fetid horehound and black archangel both are nouns.

Word	Noun	Adjective	Verb	Adverb
fetid horehound	Yes	No	No	No
black archangel	Yes	No	No	No

As nouns, fetid horehound and black archangel are synonyms defined as:

fetid horehound and black archangel: ill-smelling European herb with rugose leaves and whorls of dark purple flowers

Other synonyms of fetid horehound include Ballota nigra, black horehound, stinking horehound.

fetid horehound (noun)	black archangel (noun)
ill-smelling European herb with rugose leaves and whorls of dark purple flowers	ill-smelling European herb with rugose leaves and whorls of dark purple flowers