greater water parsnip vs Sium latifolium

greater water parsnip and Sium latifolium both are nouns.

Word	Noun	Adjective	Verb	Adverb
greater water parsnip	Yes	No	No	No
Sium latifolium	Yes	No	No	No

As nouns, greater water parsnip and Sium latifolium are synonyms defined as:

greater water parsnip and Sium latifolium: large stout white-flowered perennial found wild in shallow fresh water; Europe

greater water parsnip (noun)	Sium latifolium (noun)
large stout white-flowered perennial found wild in shallow fresh water; Europe	large stout white-flowered perennial found wild in shallow fresh water; Europe