Spanish needles vs beggar-ticks

Spanish needles and beggar-ticks both are nouns.

Word	Noun	Adjective	Verb	Adverb
Spanish needles	Yes	No	No	No
beggar-ticks	Yes	No	No	No

As nouns, beggar-ticks is a hypernym of Spanish needles; that is, beggar-ticks is a word with a broader meaning than Spanish needles:

Spanish needles: common bur marigold of the eastern United States
beggar-ticks: 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, bur marigold, burr marigold, sticktight.

As nouns, Spanish needles and beggar-ticks are synonyms defined as:

Spanish needles (noun)	beggar-ticks (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	the seed of bur marigolds