alkali grass vs death camas

alkali grass and death camas both are nouns.

Word	Noun	Adjective	Verb	Adverb
alkali grass	Yes	No	No	No
death camas	Yes	No	No	No

As nouns, death camas is a hypernym of alkali grass; that is, death camas is a word with a broader meaning than alkali grass:

alkali grass: plant of western North America having grasslike leaves and greenish-white flowers
death camas: any of various plants of the genus Zigadenus having glaucous leaves and terminal racemes of mostly white flowers; all are poisonous

Other hypernyms of alkali grass include zigadene.

alkali grass (noun)	death camas (noun)
plant of western North America having grasslike leaves and greenish-white flowers	any of various plants of the genus Zigadenus having glaucous leaves and terminal racemes of mostly white flowers; all are poisonous