Grindelia robusta vs rosinweed

Grindelia robusta and rosinweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
Grindelia robusta	Yes	No	No	No
rosinweed	Yes	No	No	No

As nouns, rosinweed is a hypernym of Grindelia robusta; that is, rosinweed is a word with a broader meaning than Grindelia robusta:

Grindelia robusta: perennial gumweed of California and Baja California
rosinweed: any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock

Other hypernyms of Grindelia robusta include gum plant, gumweed, tarweed.

Grindelia robusta (noun)	rosinweed (noun)
perennial gumweed of California and Baja California	North American perennial having a resinous odor and yellow flowers
	any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock