melosa vs tarweed

melosa and tarweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
melosa	Yes	No	No	No
tarweed	Yes	No	No	No

As nouns, tarweed is a hypernym of melosa; that is, tarweed is a word with a broader meaning than melosa:

melosa: South American herb with sticky glandular foliage; source of madia oil
tarweed: any of various resinous glandular plants of the genus Madia; of western North and South America

melosa (noun)	tarweed (noun)
South American herb with sticky glandular foliage; source of madia oil	any of various resinous glandular plants of the genus Madia; of western North and South America
	any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock