A term used for the greatest of the Valar (S/29), it is the adjective arata “high, exalted” used as a plural name.
Quenya
arata
high, lofty, noble
arata
adjective. high, noble, exalted, lofty
arta
adjective. high, noble, exalted, lofty
aratar
collective name. High Ones, The Exalted, The Supreme
Aratan
noble adan
Aratan masc. name *"Noble Adan" (Silm)
aratan
masculine name. *Noble Man
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)
arata
high, lofty, noble
arata adj. "high, lofty, noble" (PE17:49, 186). Also used as a a noun with nominal pl. form Aratar "the Supreme", the chief Valar, translation of the foreign word Máhani adopted and adapted from Valarin (WJ:402). Aratarya "her sublimity"; Varda Aratarya "Varda the lofty, Varda in her sublimity" (WJ:369). In one source, Aratar is translated as a singular: "High One" (PE17:186)
Máhan
doom ring
Máhan (pl. Máhani attested in WJ:402), noun: one of the eight chiefs of the Valar (adopted and adapted from Valarin, but usually translated as Aratar). Máhanaxar the "Doom Ring" of Aman; adopted and adapted from Valarin. (WJ:399)
Ara-
noble
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)
arquen
noble
arquen noun "a noble" (WJ:372), "knight" (PE17:147)
halda
adjective. high, tall
tar-
affix. high, high; [ᴹQ.] king or queen (in compounds)
tá
high
tá 2) adj. "high" (LT1:264; there spelt tâ. This is hardly a valid word in Tolkien's later Quenya, but cf. tára "lofty".)
tána
high, lofty, noble
tána (meaning unclear, probably adj. "high, lofty, noble") (TĀ/TA3). Compare tára.
arata adj. "high, lofty, noble" (PE17:49, 186). Also used as a a noun with nominal pl. form Aratar "the Supreme", the chief Valar, translation of the foreign word Máhani adopted and adapted from Valarin (WJ:402). Aratarya "her sublimity"; Varda Aratarya "Varda the lofty, Varda in her sublimity" (WJ:369). In one source, Aratar is translated as a singular: "High One" (PE17:186)