The word Balchoth is a mixture of the Westron word ‘balc’ = horrible and the Sindarin word ‘hoth’ = horde.

The Balchoth were Easterlings and were akin to the Wainriders. They lived in the lands east of Mirkwood and were thought to be loyal to those who occupied Dol Guldur. They invaded Calenardhon in TA 2510 but were defeated at the Battle of the Field of Celebrant.
Encyclopedia entry originally written by Nienna-of-the-Valar