southern buckthorn vs shittim

southern buckthorn and shittim both are nouns.

Word	Noun	Adjective	Verb	Adverb
southern buckthorn	Yes	No	No	No
shittim	Yes	No	No	No

As nouns, southern buckthorn and shittim are synonyms defined as:

southern buckthorn and shittim: shrubby thorny deciduous tree of southeastern United States with white flowers and small black drupaceous fruit

Other synonyms of southern buckthorn include Bumelia lycioides, mock orange, shittimwood.

southern buckthorn (noun)	shittim (noun)
shrubby thorny deciduous tree of southeastern United States with white flowers and small black drupaceous fruit	shrubby thorny deciduous tree of southeastern United States with white flowers and small black drupaceous fruit