crazyweed vs crazy weed

crazyweed and crazy weed both are nouns.

Word	Noun	Adjective	Verb	Adverb
crazyweed	Yes	No	No	No
crazy weed	Yes	No	No	No

As nouns, crazyweed and crazy weed are synonyms defined as:

crazyweed and crazy weed: any of several leguminous plants of western North America causing locoism in livestock

Other synonyms of crazyweed include locoweed.

crazyweed (noun)	crazy weed (noun)
any of several leguminous plants of western North America causing locoism in livestock	any of several leguminous plants of western North America causing locoism in livestock