ball nettle vs horse nettle

ball nettle and horse nettle both are nouns.

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

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

ball nettle and horse 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, bull nettle, Solanum carolinense.

ball nettle (noun)	horse 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