helmet flower vs Aconitum napellus

helmet flower and Aconitum napellus both are nouns.

Word	Noun	Adjective	Verb	Adverb
helmet flower	Yes	No	No	No
Aconitum napellus	Yes	No	No	No

As nouns, helmet flower and Aconitum napellus are synonyms defined as:

helmet flower and Aconitum napellus: a poisonous herb native to northern Europe having hooded blue-purple flowers; the dried leaves and roots yield aconite

Other synonyms of helmet flower include helmetflower, monkshood.

helmet flower (noun)	Aconitum napellus (noun)
a poisonous herb native to northern Europe having hooded blue-purple flowers; the dried leaves and roots yield aconite	a poisonous herb native to northern Europe having hooded blue-purple flowers; the dried leaves and roots yield aconite