rattle weed vs horsefly weed

rattle weed and horsefly weed both are nouns.

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

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

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

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

rattle weed (noun)	horsefly 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