A title of assumed by Morgoth when he lay claim to the world in Silmarillion revisions from the 1950s-60s (MR/121), but not appearing in the published version of The Silmarillion. This name is a compound of tar- “king” and Ambar “World”, the second element appearing in its rarer alternate form: Umbar (see PE17/105).
Conceptual Development: The title was first written as (rejected) Aran Endór “King of Middle-earth”.
Tarumbar noun; apparently "King of the World" (possibly an ephemeral form): this would be tár "king" (q.v.) + umbar as a variant of Ambar "world".