Sindarin 

aran

king

1) (king of a region) aran (pl. erain). Coll. pl. aranath. Also †âr with stem-form aran- (also with pl. erain; the longer form aran may be a back-formation from this plural). 2) (king of a people)taur (i daur, o thaur) (said in LR:389 s.v. _T_Ā to refer to ”legitimate kings of the whole tribes”), pl. toer (i thoer), coll. pl. torath.