herb roberts vs crane's bill

herb roberts and crane's bill both are nouns.

Word	Noun	Adjective	Verb	Adverb
herb roberts	Yes	No	No	No
crane's bill	Yes	No	No	No

As nouns, crane's bill is a hypernym of herb roberts; that is, crane's bill is a word with a broader meaning than herb roberts:

herb roberts: a sticky low herb with small reddish-purple flowers; widespread in the Northern Hemisphere
crane's bill: any of numerous geraniums of the genus Geranium

Other hypernyms of herb roberts include cranesbill.

herb roberts (noun)	crane's bill (noun)
a sticky low herb with small reddish-purple flowers; widespread in the Northern Hemisphere	any of numerous geraniums of the genus Geranium