I found an edu site with a long list of unusual words. I'll put a sampling of them here each day.
aba: garment of camel or goat hair; camel or goat-hair fabric
abditive: remote; secret; hidden
ablepsia: blindness
aboideau: tide gate
abraid: to awaken or rouse
abthane: monastic region of the old Irish church
aby: to make amends; atone; pay a penalty
acatour: provisioner; quartermaster
accentor: songbird