marijuana vs locoweed

marijuana and locoweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
marijuana	Yes	No	No	No
locoweed	Yes	No	No	No

As nouns, locoweed is a hyponym of marijuana; that is, locoweed is a word with a more specific, narrower meaning than marijuana:

marijuana: the most commonly used illicit drug; considered a soft drug, it consists of the dried leaves of the hemp plant; smoked or chewed for euphoric effect
locoweed: street names for marijuana

Other hyponyms of marijuana include Acapulco gold, Mexican green, dope, gage, grass, green goddess, Mary Jane, pot, sens, sess, skunk, smoke, weed, kief.

marijuana (noun)	locoweed (noun)
the most commonly used illicit drug; considered a soft drug, it consists of the dried leaves of the hemp plant; smoked or chewed for euphoric effect	street names for marijuana
a strong-smelling plant whose dried leaves can be smoked for a pleasant effect or pain reduction	any of several leguminous plants of western North America causing locoism in livestock