black haw vs false buckthorn

black haw and false buckthorn both are nouns.

Word	Noun	Adjective	Verb	Adverb
black haw	Yes	No	No	No
false buckthorn	Yes	No	No	No

As nouns, black haw and false buckthorn are synonyms defined as:

black haw and false buckthorn: deciduous tree of southeastern United States and Mexico

Other synonyms of black haw include Bumelia lanuginosa, chittamwood, chittimwood, shittimwood.

black haw (noun)	false buckthorn (noun)
upright deciduous shrub having frosted dark-blue fruit; east and east central North America	deciduous tree of southeastern United States and Mexico
deciduous tree of southeastern United States and Mexico