sugarberry vs nettle tree

sugarberry and nettle tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
sugarberry	Yes	No	No	No
nettle tree	Yes	No	No	No

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

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

Other hypernyms of sugarberry include hackberry.

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