shittim vs southern buckthorn

shittim and southern buckthorn both are nouns.

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

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

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

Other synonyms of shittim include Bumelia lycioides, mock orange, shittimwood.

shittim (noun)	southern buckthorn (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