gromwell vs Lithospermum officinale

gromwell and Lithospermum officinale both are nouns.

Word	Noun	Adjective	Verb	Adverb
gromwell	Yes	No	No	No
Lithospermum officinale	Yes	No	No	No

As nouns, gromwell and Lithospermum officinale are synonyms defined as:

gromwell and Lithospermum officinale: European perennial branching plant; occurs in hedgerows and at the edge of woodlands

gromwell (noun)	Lithospermum officinale (noun)
European perennial branching plant; occurs in hedgerows and at the edge of woodlands	European perennial branching plant; occurs in hedgerows and at the edge of woodlands