sugarberry vs hackberry

sugarberry and hackberry both are nouns.

Word	Noun	Adjective	Verb	Adverb
sugarberry	Yes	No	No	No
hackberry	Yes	No	No	No

As nouns, sugarberry and hackberry are synonyms defined as:

sugarberry and hackberry: small edible dark purple to black berry with large pits; southern United States

As nouns, hackberry is a hypernym of sugarberry; that is, hackberry is a word with a broader meaning than sugarberry:

sugarberry: deciduous shade tree with small black berries; southern United States; yields soft yellowish wood
hackberry: any of various trees of the genus Celtis having inconspicuous flowers and small berrylike fruits

Other hypernyms of sugarberry include nettle tree.

sugarberry (noun)	hackberry (noun)
small edible dark purple to black berry with large pits; southern United States	small edible dark purple to black berry with large pits; southern United States
deciduous shade tree with small black berries; southern United States; yields soft yellowish wood	any of various trees of the genus Celtis having inconspicuous flowers and small berrylike fruits