poison camas vs zigadene

poison camas and zigadene both are nouns.

Word	Noun	Adjective	Verb	Adverb
poison camas	Yes	No	No	No
zigadene	Yes	No	No	No

As nouns, zigadene is a hypernym of poison camas; that is, zigadene is a word with a broader meaning than poison camas:

poison camas: a common perennial death camas; Tennessee to Kansas to Texas
zigadene: any of various plants of the genus Zigadenus having glaucous leaves and terminal racemes of mostly white flowers; all are poisonous

Other hypernyms of poison camas include death camas.

poison camas (noun)	zigadene (noun)
a common perennial death camas; Tennessee to Kansas to Texas	any of various plants of the genus Zigadenus having glaucous leaves and terminal racemes of mostly white flowers; all are poisonous