common tarweed vs wild flower

common tarweed and wild flower both are nouns.

Word	Noun	Adjective	Verb	Adverb
common tarweed	Yes	No	No	No
wild flower	Yes	No	No	No

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

common tarweed: California annual having red-brown spots near the base of its yellow flower rays
wild flower: wild or uncultivated flowering plant

Other hypernyms of common tarweed include wildflower.

common tarweed (noun)	wild flower (noun)
California annual having red-brown spots near the base of its yellow flower rays	wild or uncultivated flowering plant