herb robert vs Geranium robertianum

herb robert and Geranium robertianum both are nouns.

Word	Noun	Adjective	Verb	Adverb
herb robert	Yes	No	No	No
Geranium robertianum	Yes	No	No	No

As nouns, herb robert and Geranium robertianum are synonyms defined as:

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

Other synonyms of herb robert include herb roberts, herbs robert.

herb robert (noun)	Geranium robertianum (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