horsefly weed vs rattle weed

horsefly weed and rattle weed both are nouns.

Word	Noun	Adjective	Verb	Adverb
horsefly weed	Yes	No	No	No
rattle weed	Yes	No	No	No

As nouns, horsefly weed and rattle weed are synonyms defined as:

horsefly weed and rattle weed: much-branched erect herb with bright yellow flowers; distributed from Massachusetts to Florida

Other synonyms of horsefly weed include Baptisia tinctoria, indigo broom.

horsefly weed (noun)	rattle weed (noun)
much-branched erect herb with bright yellow flowers; distributed from Massachusetts to Florida	much-branched erect herb with bright yellow flowers; distributed from Massachusetts to Florida