burr marigold vs bur marigold

burr marigold and bur marigold both are nouns.

Word	Noun	Adjective	Verb	Adverb
burr marigold	Yes	No	No	No
bur marigold	Yes	No	No	No

As nouns, burr marigold and bur marigold are synonyms defined as:

burr marigold and bur marigold: any of several plants of the genus Bidens having yellow flowers and prickly fruits that cling to fur and clothing

Other synonyms of burr marigold include beggar's-ticks, beggar-ticks, sticktight.

burr marigold (noun)	bur marigold (noun)
any of several plants of the genus Bidens having yellow flowers and prickly fruits that cling to fur and clothing	any of several plants of the genus Bidens having yellow flowers and prickly fruits that cling to fur and clothing