Ara-, ar- a prefixed form of the stem Ara- "noble" (PM:344). In the masc. names Aracáno "high chieftain", mothername (amilessë, q.v.) of Fingolfin (PM:360, cf. 344), Arafinwë "Finarfin" (MR:230)
Quenya
Ender
bridegroom
Ara-
noble
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)
arquen
noble
arquen noun "a noble" (WJ:372), "knight" (PE17:147)
Ender noun "bridegroom", surname of Tulkas (NDER, TULUK, VT45:11). The form Enderō(VT45:11) is defined as "[?virile] young bridegroom"; Tolkien's gloss was not entirely legible. But this would seem to be an archaic form, because of the long final -ō (later Quenya *Endero).