tundo noun "hill, mound" (TUN)
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".
amun (amund-) noun "hill" (LT2:335; in Tolkien's later Quenya ambo)
hill, lump, clump, mass
umbo, umbon noun "hill, lump, clump, mass" (PE17:93)
unquë noun "hole, hollow" (VT46:20, UNUK), also name of tengwa #16 _(Appendix E; there spelt unque, while the Etymologies has unqe)_
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.
ecca ("k")noun "hole", apparently associated with Sindarin torech "secret hole, lair" (PE17:188)
latta (1) noun "hole, pit" (DAT/DANT, VT45:8)
hole, perforation, opening, mouth
assa "hole, perforation, opening, mouth" (GAS)