Synonyms for Ebony (same or very similar meaning)
WordNet sense 1 (tropical tree of southern Asia having hard dark-colored heartwood used in cabinetwork):
Diospyros ebenum, ebony treeWordNet sense 2 (a very dark black):
sable, coal black, jet black, pitch black, soot blackWordNet sense 3 (of a very dark black):
ebonWordNet sense 4 (having no hue):
achromaticFrom the ODE community, based on WordNetadd/edit