stinking horehound vs Ballota nigra

stinking horehound and Ballota nigra both are nouns.

Word	Noun	Adjective	Verb	Adverb
stinking horehound	Yes	No	No	No
Ballota nigra	Yes	No	No	No

As nouns, stinking horehound and Ballota nigra are synonyms defined as:

stinking horehound and Ballota nigra: ill-smelling European herb with rugose leaves and whorls of dark purple flowers

Other synonyms of stinking horehound include black archangel, black horehound, fetid horehound.

stinking horehound (noun)	Ballota nigra (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