purple locoweed vs crazyweed

purple locoweed and crazyweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
purple locoweed	Yes	No	No	No
crazyweed	Yes	No	No	No

As nouns, crazyweed is a hypernym of purple locoweed; that is, crazyweed is a word with a broader meaning than purple locoweed:

purple locoweed: tufted locoweed of southwestern United States having purple or pink to white flowers
crazyweed: any of several leguminous plants of western North America causing locoism in livestock

Other hypernyms of purple locoweed include crazy weed, locoweed.

purple locoweed (noun)	crazyweed (noun)
tufted locoweed of southwestern United States having purple or pink to white flowers	any of several leguminous plants of western North America causing locoism in livestock