Synonyms for Sloe (same or very similar meaning)
WordNet sense 1 (a thorny Eurasian bush with plumlike fruits):
blackthorn, Prunus spinosaWordNet sense 2 (wild plum of northeastern United States having dark purple fruits with yellow flesh):
Allegheny plum, Alleghany plum, Prunus alleghaniensisFrom the ODE community, based on WordNetadd/edit