Túna (also Tún) place-name, used of the hill on which Tirion was built (Silm, TUN, KOR), derived from a stem (TUN) apparently meaning simply *"hill, mound".
Quenya
amun
hill
ambona
noun. hill
Túna
hill, mound
tundo
hill, mound
tundo noun "hill, mound" (TUN)
ambo
hill, rising ground
ambo noun "hill, rising ground" (Markirya, PE17:92), "mount" (PE17:157), allative pl. ambonnar "upon hills" in Markirya (ruxal' ambonnar "upon crumbling hills") According to VT45:5, ambo was added to the Etymologies as a marginal note.
umbo
hill, lump, clump, mass
umbo, umbon noun "hill, lump, clump, mass" (PE17:93)
amun (amund-) noun "hill" (LT2:335; in Tolkien's later Quenya ambo)