WordNet sense 1 (thorny Eurasian shrub with dry woody winged fruit):

Christ's-thorn, Paliurus spina-christi

WordNet sense 2 (spiny tree having dark red edible fruits):

jujube, jujube bush, Ziziphus jujuba

WordNet sense 3 (large shrub or shrubby tree having sharp spines and pinnate leaves with small deciduous leaflets and sweet-scented racemose yellow-orange flowers; grown as ornamentals or hedging or emergency food for livestock; tropical America but naturalized in southern United States):

horsebean, Parkinsonia aculeata

WordNet sense 4 (East Indian spiny tree having twice-pinnate leaves and yellow flowers followed by flat pods; source of black catechu):

catechu, Acacia catechu