gum plant vs gumweed

gum plant and gumweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
gum plant	Yes	No	No	No
gumweed	Yes	No	No	No

As nouns, gum plant and gumweed are synonyms defined as:

gum plant and gumweed: any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock

Other synonyms of gum plant include rosinweed, tarweed.

gum plant (noun)	gumweed (noun)
any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock	any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock