Spanish needles vs bur marigold

Spanish needles and bur marigold both are nouns.

Word	Noun	Adjective	Verb	Adverb
Spanish needles	Yes	No	No	No
bur marigold	Yes	No	No	No

As nouns, bur marigold is a hypernym of Spanish needles; that is, bur marigold is a word with a broader meaning than Spanish needles:

Spanish needles: common bur marigold of the eastern United States
bur marigold: any of several plants of the genus Bidens having yellow flowers and prickly fruits that cling to fur and clothing

Other hypernyms of Spanish needles include beggar's-ticks, beggar-ticks, burr marigold, sticktight.

Spanish needles (noun)	bur marigold (noun)
common bur marigold of the eastern United States	any of several plants of the genus Bidens having yellow flowers and prickly fruits that cling to fur and clothing
the seed of bur marigolds