horse nettle vs ball nettle

horse nettle and ball nettle both are nouns.

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

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

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

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

horse nettle (noun)	ball 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