Aconite and Helmet flower

Aconite noun - Any of various usually poisonous plants of the genus Aconitum having tuberous roots and palmately lobed leaves and blue or white flowers.

Helmet flower and aconite are semantically related. In some cases you can replace phrase "Helmet flower" with "Aconite", this terms are similar.

Helmet flower noun - A poisonous herb native to northern Europe having hooded blue-purple flowers; the dried leaves and roots yield aconite.

Aconite and helmet flower are semantically related. You can use "Aconite" instead a noun phrase "Helmet flower".