Quenya 

Anamo

of doom

Anamo noun in genitive "of doom" in Rithil-Anamo "Ring of Doom" (q.v.) Since the reference is to a place (a circle) where judgement was passed, this seems to be "doom" in the sense of "juridical decision" or "(legal) justice". The nominative "doom" may be *anan, with stem anam- (since the root would be NAM as in nam- "to judge", námo* noun "judge"). Alternatively, but less probably, the nominative may be anama**.