Quenya 

arato

noble

arato noun "a noble" (PE17:147), in PE17:118 given as aratō and there glossed "lord" (often = "king"). Cf. aráto. The form cited in the latter source, aratō with a long final vowel, is evidently very archaic (compare Enderō under Ender); later the vowel would become short. (PE17:118)