ball nettle vs bull nettle

ball nettle and bull nettle both are nouns.

Word	Noun	Adjective	Verb	Adverb
ball nettle	Yes	No	No	No
bull nettle	Yes	No	No	No

As nouns, ball nettle and bull nettle are synonyms defined as:

ball nettle and bull nettle: coarse prickly weed having pale yellow flowers and yellow berrylike fruit; common throughout southern and eastern United States

Other synonyms of ball nettle include ball nightshade, horse nettle, Solanum carolinense.

ball nettle (noun)	bull nettle (noun)
coarse prickly weed having pale yellow flowers and yellow berrylike fruit; common throughout southern and eastern United States	coarse prickly weed having pale yellow flowers and yellow berrylike fruit; common throughout southern and eastern United States