herb roberts vs herbs robert

herb roberts and herbs robert both are nouns.

Word	Noun	Adjective	Verb	Adverb
herb roberts	Yes	No	No	No
herbs robert	Yes	No	No	No

As nouns, herb roberts and herbs robert are synonyms defined as:

herb roberts and herbs robert: a sticky low herb with small reddish-purple flowers; widespread in the Northern Hemisphere

Other synonyms of herb roberts include Geranium robertianum, herb robert.

herb roberts (noun)	herbs robert (noun)
a sticky low herb with small reddish-purple flowers; widespread in the Northern Hemisphere	a sticky low herb with small reddish-purple flowers; widespread in the Northern Hemisphere